改错:If they don't finish their homework,they work till finish it.

问题描述:

改错:If they don't finish their homework,they work till finish it.
A.改 don't
B.改 their
C.改后一句的work
D.改后一句的finish
_____

选C~
If they don't finish their homework,they will work till finish it.
IF 引导的从句,条件句是一般现在时态,主句就应该是将来时态~