1.
问题描述：
1.
—So you were in the supermarket _____ you heard a strange sound,right?
—That's ture.Iran out as quickly as possible.
A.when B.while c.then D.which
2.
There is a bird singing _____ the tree.
A.in B.on C.at D.with
3.
I'm sorry ,I didn't _____ you clearly.Would you say it again?
A.hear B.notice C.see D.watch
答
a aa