Weknowthatasmileisusuallyasign
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问题详情:
We know that a smile is usually a sign _____ people feel friendly and happy, but _____ we don’t know who the new person is?
A. that; what if B. when; what C. when; how about D. if; how
【回答】
A
知识点:连词
题型:选择题
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