He was busy writing the exam paper , only ___once in a while to check the time.
#94095
A
to stop
B
stopping
C
to have stopped
D
having stopped
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—Tom is so worried about the test that he said he was going to study all night. —Tell him he should quit ______ and get some help.
#93350
A
to have worried
B
to worry
C
worrying
D
from worrying
_____ of danger in the street at night, she had to go home, with a friend ____ her.
#98646
A
Warning, following
B
Having warned, following
C
Having been warned, following
D
Warned, followed
It is believed to _____ over by sandstorms from AD 200 to AD 400.
#88245
A
gradually cover
B
be gradually being covered
C
have been gradually covered
D
be gradually covered
The Changjiang River has been polluted badly and is not good _______．
#96869
A
to swim it
B
to be swum in
C
to swim in it
D
to swim in
—What do you think made Celia so happy?—________a prize in the recent competition.
#88281
A
As she won
B
Won
C
Winning
D
Because of winning