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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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After the long-distance running race, we students returned home, ___________.

A．happily but tired

B．happily and tiring

C．happy but tired

D．happy and tiring

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This is the very plan for our May Day holiday _______ was made by our classmates.

A．which

B． that

C．who

D．what

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Is _____ necessary to take off our shoes when we enter the computer lab?

A．this

B．it

C．everyone

D．he

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____ matters most in learning English is enough practice.

A．What

B．Why

C．Where

D．Which

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Only whenin the afternoonable to leave．

A．the match was over; they were	B．was the match over; were they
C．was the match over; they were	D．the match was over; were they

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