单项选择题

It was at the very beginning Mr. Fox made the decision ____ we should send
more firefighters here.

A．when, which
B．when, that
C．then, so
D．that, that

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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

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

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