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

MrSmith found that gas from the pipe when he came back because we forgot to switch offBut at last we were lucky to escape

The moffered him their help.

These suitcases are too heavy for me to move—Here, I’ll give you a hand _______ them

Bear in _____ that tomorrow is our dearmother’s birthday．

―_____ Lily ________ the USA―_______, but now she lives in China.