【題目】I don’t know he will come tomorrow, he comes, I will tell you.

A. if; whetherB. whether; whether

C. whether; ifD. that, whether

【答案】C

【解析】if既可以引導(dǎo)賓語從句又可以引導(dǎo)狀語從句。if充當(dāng)賓語從句的連接詞時，相當(dāng)于whether，詞義為“是否”，遵循賓語從句的時態(tài)規(guī)則，可根據(jù)語境選擇任何時態(tài)；充當(dāng)從屬連詞，引導(dǎo)條件狀語從句時，詞義為“如果”，若主句中的謂語動詞用一般將來時，則從句中的謂語動詞通常用一般現(xiàn)在時表示將來。

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