问题

Have you found the missing?couple in the mountain ? —No, but we hard to get in touch with them

A:have tried
B:have been trying
C:had tried
D:had been trying

正确答案是：

同类题型

, which used to be called“love-apple”, is not ____but ______

下列各句中，没有语病的一句是（）

There is going _____a football match this Friday.

With his mother　　him, he is getting on well with his work.

He hopes ______ a swimmer in the future, so he is busy practicing ______ after school.