—— I can’t get through to the general manager’s office anyhow. —— The line is busy. Someone_____the telephone. 
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A
must use
B
uses
C
must have been using
D
must be using
推荐题目
But for the help of my English teacher,I________the first prize in the English Writing Competition.
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A
would not win
B
would not have won
C
would win
D
would have won
The people from all over the world demand that reforms______.
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A
have been done
B
be done
C
are done
D
might be done.
 My suggestion is that a plan for study ____ at first.
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A
will be made
B
be made
C
was made
D
be should made