单项选择题

Sam assured his boss that he would______ all his energies in doing this new job.

A.call forth
B.call at
C.call on
D.call off
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单项选择题
He's done stupid things before, but to look for the escaping gas with a match really was the______ silliness.
A.ultimate
B.unanimous
C.triumphant
D.trivial
单项选择题
The United Nations Conference on Drug Abuse, which took place earlier this year in Vienna, was a very______ meeting.
A.compulsory
B.profound
C.productive
D.extravagant
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