I don’t know if he ____ us; if he ____, I’ll let you know.
A．will come and help; comesB．comes and helps; will come
C．will come and help; will comeD．comes and helps; comes
A
第一個if的意思“是否”，引導(dǎo)賓語從句，根據(jù)句意應(yīng)該用將來時態(tài)。第二個if的意思“如果”，引導(dǎo)條件狀語從句，從句用一般現(xiàn)在時態(tài)代替將來時態(tài)，所以答案A。
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