单项选择题

Your compass and clock are the most essential instruments in sailing.

A. equipments
B. tools
C. instructions
D. opportunities
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单项选择题
I notified him that the meeting had been postponed.
A. informed
B. observed
C. mocked
D. misled
单项选择题
I reserve the fight to disagree.
A. deserve
B. keep
C. perceive
D. notice
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