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第1题

We will not attack ______ we are attacked; if attacked, we will certainly counter-attack. A. if B. when C. unless
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第2题

I was just congratulating her ________ having won her race. A. for B. off C. in D. on
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第3题

People working in the government should not ___________ business affairs that might change their political judgement.
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第4题

Through long power lines electricity goes ______. A. to the place needed B. there it is needed C. where it is need
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