Land animals are believed ______ from sea animals.
#103259
A
to have developed
B
to have been developed
C
having developed
D
having been developed
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(2013·高考浙江卷)During the last three decades，the number of people participating in physical fitness programs ________ sharply.
#99703
A
was increasing
B
has increased
C
had increased
D
will be increasing
—Did you find the missing couple in the mountain yesterday?—No, but we ________ to get in touch with them ever since.
#104758
A
have tried
B
have been trying
C
had tried
D
had been trying
Scientists have many theories about how the universe into being.
#101788
A
came
B
was coming
C
had come
D
would come
Last week I took the Civil Service Admission Examination, for which I _____ for nearly three months．
#102168
A
had prepared
B
would prepare
C
was preparing
D
have been preparing
It was the second time we _____ in holding such important parties.
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A
succeed
B
had succeeded
C
succeeded
D
have succeeded