问题

So hard __________ in the past few months that he has made great progress in English–I can see that, only a few mistakes he made in this exam

A:he worked
B:did he work
C:he has worked
D:has he worked

正确答案是：

同类题型

After the earthquake, the first thing the local government did was to provide ____________ for the homeless families.

tried to _____the chance but failed.

—Where was it that you found your bag? —– It was in the restaurant _________ we had lunch yesterday.

If you like the new car, why not buy it— But it’s really expensive. I can’t ______ it.

下列各句中，没有语病、句意明确的一项是（）