单项选择题
A.within B.about C.under D.after
（）these children know the answer.A.MostB.SomeC.Most ofD...
单项选择题（）these children know the answer.
A.Most B.Some C.Most of D.Few
Goodbye, Miss Liu. I'm very pleased（）A.to meet youB.hav...
单项选择题Goodbye, Miss Liu. I'm very pleased（）
A.to meet you B.having met you C.be meeting you D.to have met you
In China, children（）school at seven.A.has to startB.mus...
单项选择题In China, children（）school at seven.
A.has to start B.must to start C.have to start D.can start
