I don’t know if she ______.If she ______, please let me know.
A comes, comes     B will come, will come      C will come ,comes           
C
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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