题目内容

【题目】I don't know _____ he will come tomorrow, _____ he comes, I will tell you.
A.if; whether
B.whether; whether
C.whether; if
D.if ; /

【答案】C
【解析】句意：我不知道他明天是否会来，如果他来了，我会告诉你。whether与if都可以用作“是否”，但是用作“如果”时只能是if。利用排除法，故选C。

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