TheywerebusyanexperimentwhenIc

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They were busy ________ an experiment when I came.

A．doing

B．to be doing

C．with doing

D．to do

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The moment I got back to the classroom, I found I _______ my jacket on the playground.

A．left

B．had left

C．have left

D．was leaving

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Studying in our newly-built school is so wonderful a period _____ every one of us will treasure forever.

A．that

B．as

C．which

D．when

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--- Can you join us for the party to be held by old friends this weekend?
--- Awfully sorry. It is one year since I _____ in China.

A．lives	B．lived
C．live	D．will live

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--- What an easy examination paper , isn’t it ?
--- Quite right. How I regretted that I _____ such a silly mistake!

A．could have made	B．would have made
C．should have made	D．might have made

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_____ computer games, his parents were very worried about his future.

A．Addicted to	B．Addicting to
C．He addicted to	D．His addicting to

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