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问题: 时态

Their new teacher has arrived,but they___that he____until this morning.
A didn't know;was coming
B don't konw;would come
C didn't know;had come
D don't konw;will come

解答:

C
他们直到今天早晨才知道,因此在今天早晨之前是不知道的,用一般过去时,而教师到来发生在他们知道之前,也就是“过去的过去”,所以应该用过去完成时。