【題目】I don't know _______ he will come tomorrow. ________ he comes, I'll tell you.
A.if; Whether
B.whether; Whether
C.if; That
D.if; If

【答案】D
【解析】句意:我不知道他明天是否會來。如果他來,我會告訴你。If如果,引導條件狀語從句;是否,引導賓語從句;Whether是否,引導賓語從句。That那,可以引導賓語從句。所以選D。

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