My pain ______ apparent the moment I walked

. My pain ___________ obvious the moment I walked into the room, for the first man I met asked me pitifully:" Are you feeling all right?" A．must be B．must have been C．could be D．could have been

My pain _____ obvious the moment I entered the office，for the first man I met asked pitifully，“Are you feeling all right？” A．could be B．could have been C．must be D．must have been

要简析
My pain____apparent the moment I walked into the room,for the first man O met asked sympathetically:'Are you feeling all right?"
A.must be B.must have been C.had been D.had to be
have to 能表示肯定推测吗?要是能表示肯定推测,对过去的推测该怎么表达?

1.My pain ______ apparent the moment I walked into the room,for the first man I met asked sympathetically:“Are you feeling all right?”
A.must be
B.must have been
C.had been
D.had to be
2.People appreciate ______ with him because he has a good sense of humor.
A.to work
B.to have worked
C.working
D.having worked
3.Wells made us believe the fact _____the scientific knowledge is the key to our own future.
A.what
B.which
C.that
D.why
4.The car ______ halfway for no reason.
A.broke off
B.broke down
C.broke up
D.broke out
5.I will give this ticket to _____wants to have it.
A.whom
B.whoever
C.whomever
D.who
6.It’s necessary that you spoken English now and then.
A.mightpractise
B.mustpractise
C.shouldpractise
D.practised
7.When Clinton came to Xian,the policemen had fully prepared for that _____he would be murdere;
A.supporting
B.if
C.sothat
D.forfearthat
8.The ____ edition of the dictionary is far better than the previous ones.
A.late
B.last
C.lasting
D.latest
9.She often loves to count on others to help.But _____.
A.neitherdoI
B.Idon’t
C.sodoI
D.norIdo
10.English _____all over the worl; And many children start to learn English at very young age.
A.isspeaking
B.speaking
C.speaks
D.isspoken
11.The good man seemed us all that he knew at this last lessen.
A.totryteaching
B.tobetryingtoteach
C.totrytoteach
D.tobetryingteaching
12..On seeing an old woman _____off.A young man rushed up to help her.
A.falling
B.fall
C.fell
D.felt

my pain___obvious the moment i walked into the room,for the first man i met asked pitfully:"Are you feeling all right?"
A.must be B.could be
c.must have been D.could have been
为什么选c?原因.