Why hasn't he come? ______on time, we will have to put off the trip.A. If he doesn't comeB. If he won't comeC. If he shouldn't comeD. If he hadn't come

Why hasn't he come? ______on time, we will have to put off the trip.

A. If he doesn't come

B. If he won't come

C. If he shouldn't come

D. If he hadn't come

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