Tom failed ______ the experiment yesterday.
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A
doing
B
did
C
to do
D
do
推荐题目
On AIDS Day, the minister of Health Department demanded that the problems ______ paid special attention to. 
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A
referred to being
B
referred to be
C
refer to being
D
refer to be
I am looking forward to ______ your answer as soon as possible.
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A
receiving
B
being received
C
receive
D
be received
When this happens, he smiles and nods, ____ that everything is fine.
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A
indicated
B
indicating
C
to indicate
D
indicate