单项选择题
() you the officer on duty?
A.Is
B.Be
C.Are
D.Have
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单项选择题
Spread a () net under the gangway.
A.safe
B.safety
C.danger
D.dangerous
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单项选择题
—What business do you have?—I want to ()your captain.
A.see
B.saw
C.seen
D.seeing
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