单项选择题

The newly-discovered medicine had its ______ only on ordinary colds.

A. effect
B. affect
C. impression
D. influence
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单项选择题
In their withdrawal, the enemy left ______ thousands of machine guns.
A. for
B. behind
C. out
D. in
单项选择题
He was ______ minister to a foreign country.
A. appointed
B. named
C. applied
D. pointed to
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