I don’t know when he ____. But if he ____, I’ll ring you up.
A．comes, will comeB．will come, will come
C．comes, comesD．will come, comes
D
本題考查動(dòng)詞時(shí)態(tài)。第一個(gè)空前的when引導(dǎo)賓語(yǔ)從句，此處用一般將來(lái)時(shí)；第二個(gè)空前的if作“如果”講，引導(dǎo)條件狀語(yǔ)從句，主句用了一般將來(lái)時(shí)，故此處用一般現(xiàn)在時(shí)表示將來(lái)。
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