These diagrams are especially helpful when we have a concrete problem ______ at hand.
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A
be solved
B
to solve
C
solved
D
being solved
推荐题目
The managers discussed the plan that they would like to see ______ the next year.
#92152
A
to carry out
B
to be carried out
C
carried out
D
being carried out
 The H7N9 flu is reported ______  higher fever and coughing for several days.
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A
taking the form of
B
to take the form of
C
to be taken the form of
D
having taken the form of
 He is said ________ college in America, studying music.
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A
to be attending
B
that attend
C
to be attended
D
that attending