摘要： This exercise requires carefully. We should do as we are required . A. to do ; doing B. to be done ; doing C. to be done ; to doing D. doing ; to do

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This exercise requires carefully. We should do as we are required .

A.
to do; doing
B.
to be done; doing
C.
to be done; to doing
D.
doing; to do

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This exercise requires ________ carefully. We should do as we are required ________.

[　　]

A．to do; doing

B．to be done; doing

C．to be done; to doing

D．doing; to do

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This exercise requires ________ carefully. We should do as we are required ________.

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This exercise requires carefully. We should do as we are required .