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题文

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
科目 英语   题型 单选题   难度 中等
知识点: 与数量有关的代词和限定词
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