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______ it have been the failure to pick up directions from the ground control that caused the air crash?

A．Must

B．Could

C．Would

D．Should

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All the preparations_____, we're ready to start.

A．made

B．being made

C．having made

D．have been made

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--Do you know when the Chinese custom_________ from?
--It's hard to say. But its characteristics__________ the Tang Period.

A．began; prove	B．started; show
C．is; appear	D．dates; suggest

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--You went late the stadium yesterday evening, didn't you?
--Yes, my wife was a little late _________ the supper.

A．to; with

B．for; with

C．for; for

D．at; for

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After you have used the dictionary, please just put it back ______it belongs.

A．where

B．to which

C．what

D．that

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It is usually not quite cold in this area in March, but sometimes temperature __________be very low.

A．should

B．can

C．must

D．shall

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