【題目】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會來,如果他來了,我會告訴你。whether與if都可以用作“是否”,但是用作“如果”時(shí)只能是if。利用排除法,故選C。

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