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1.___ while the iron is hot.

A. Strike

B. Hit

C. Beat

D. Knock

【答案】A

2.I found a wallet ___ on the ground.

A. laying

B. lying

C. lay

D. lie

【答案】B

3.I haven't ___ his letter yet.

A. written

B. answered

C. replied

D. returned

【答案】B

4.They ___ the different parts into one.

A. United

B. connected

C. joined

D. linked

【答案】A

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