Weshouldpreventsuchasillymista

We should prevent such a silly mistake _____ again.

A．occurring	B．to occur
C．to be occurred	D．from being occurred

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He had ______ in finding Mr. Green’s house.

A．many difficulties	B．many difficulty
C．much difficulties	D．much difficulty

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——Who telephoned just now?
——Sorry. I couldn’t ______ the voice.

A．recognize

B．realize

C．know

D．understand

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Only when ______ in 1918, ______ happily back to work.

A．the war was over … he went	B．was the war over … did he go
C．the war was over … did he go	D．was the war over … he went

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The boy would have died, _______ on him without delay.

A．if the doctor didn’t operate	B．if the doctor wouldn’t operate
C．would the doctor not operate	D．had the doctor not operated

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Do you mind ______ how you succeed?

A．if I go and see

B．if I go seeing

C．my going and see

D．my go to see

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