问题

Did you find the missing couple in the mountain yesterday?——No, but we _____ to get in touch with them ever since

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

正确答案是：

同类题型

It’s reported that over 1 billion people watched the live opening ceremony of______2010 South Africa World Cup on TV.—Yes, news came as________shock to me.

You are hungry. _____ eating some noodles

Changing the design of a new product may ______ therisk of its production in the market.

Imagine what today’s life would be like ifAlexander Bellthe telephone morethan 130 years ago!

How much did you pay for that— I paid _____ that you paid