单项选择题

The young man assured the boss that he would ______ all his energies to do the job well.

A. call on
B. call forth
C. call at
D. call off
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单项选择题
We're late and the play has started. I wonder how long ago ______.
A. did it begin
B. it began
C. was it beginning
D. it has begun
单项选择题
Although he thought he was helping us to prepare the dinner, he was actually ______ the way.
A. in
B. off
C. by
D. on
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