—You look unhappy， my son?—I’m wondering how long it’ll be we come to China again.A．sinceB．whenC．beforeD．after-高中英语-n多题

◎ 题干

—You look unhappy， my son?
—I’m wondering how long it’ll be we come to China again.

A．since

B．when

C．before

D．after

◎ 答案

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◎ 解析

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◎ 知识点

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