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
I decided to go to the library as soon as I ______
A．finish what I did
B．finished what I did
C．finished what I was doing
D．would finish what I was doing
单项选择题
As ______announced in today' s papers, the Shanghai Export Commodities Fair is also open on Sundays.
A．being
B．is
C．to be
D．been
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