单项选择题

When the man came in, carrying the machine gun, most of us looked up in surprise, because we ______ anything like it before.

A. have never seen
B. never saw
C. didn’t see
D. had never seen
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单项选择题
The firm should make a substantial profit ______ satisfactory labor relations are maintained.
A. in case
B. with the purpose that
C. provided that
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单项选择题
The fire brigade arrived two hours later after the alarm was sounded, ______ it was too late to save much of the building.
A. then
B. when
C. which
D. though
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