题目内容：

____my glasses?i can't find them
I ___ them on the desk,but they're not there noww
a,do you see.have seen
b have you seen.saw
c do you see.saw
d did you see.have seen
选哪个 为什么,

优质解答

b have you seen.saw
第一个空格填现在完成时,表示到现在有没有看见.第二个空格表示过去某个时间看见,故用一般过去时