—Did you find the missing couple in the mountain yesterday?—No, but we ______ to get in touch with them ever since.
#100903
A
had tried
B
have tried
C
have been trying
D
had been trying
推荐题目
According to the art dealer, the painting ______ to go for at least a million dollars.
#104008
A
is expected
B
expects
C
expected
D
is expecting
When you don’t know a word, you can _________ in the dictionary.
#99231
A
look it up
B
set it up
C
give it up
D
pick it up
Hurry up！Mark and Carol ________ us. (2013·北京，28)
#99436
A
expect
B
are expecting
C
have expected
D
will expect
They _____ on the program for almost one week before I joined them, and now we _____ it as no good results have come out.
#101978
A
had been working; are still working
B
had worked; were still working
C
have been working; have worked
D
have worked; are still working
Experiments of this kind ___in both the U．S and Europe well before the Second World War
#100340
A
had conducted
B
have conducted
C
have been conducted
D
had been conducted