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
D. even if
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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
单项选择题
Suppose you tried to lift a 1OO-pound rock two feet, you ______ more work than if you it one feet.
A. would do...lifted
B. did...lifted
C. will do...will lift
D. would do...will lift
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