（ ）6.Juan has ____ a new bike.A.buy B.buying C.buys D.bought

uy是瞬间动词
have bought 没有错
但如果
have bought 后面 跟了一段时间 就错了
如：have bought for 1 year 就不对
要改成 have had for 1 yea

现在完成时中动词用过去分词形式，你所说的瞬间动词之类属于下面这种情况：
如果要接时间段，就必须使用可延续性动词
I have been working here for 2 years.（正确）
He has died for 2 months.(错误)
He has been dead for 2 months.(正确)

D. bought 那是语法规定的。。 现在完成是表现在。