问题

Only when he returned home ______ what had happened.

A:did he realize
B:he realized
C:he did realize
D:has he realized;

正确答案是：

同类题型

What a day! It’s mining again. We can’t go hiking tomorrow. — Don’ t worry. It won’t __________ long.

Can you imagine（想象）what our life will be like in _________ time

下列各句中，没有语病的一句是

Where is my pen?—I _________ it on thedesk, but I don’t know who _________ it away.

Alice’s father always brings her a nice gift _____he returns home from his business trip.