单项选择题

--Why did you come so late
--the bus was crowded. We ______ waiting for half an hour.

A．were kept
B．kept
C．have kept
D．had kept

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单项选择题

--You didn't write to Tom-- ______ him, too

A．Must I write to
B．Must I have written to
C．Should I write to
D．Ought I to have written to

单项选择题

--We have tried our best.--You' d better give up, nowhere,______.

A．the missing girl could be found.
B．you will find the missing girl.
C．could find the missing girl
D．could the missing girl be found

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