【題目】I dont 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既可以引導賓語從句又可以引導狀語從句。if充當賓語從句的連接詞時,相當于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);充當從屬連詞,引導條件狀語從句時,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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