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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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
单项选择题
A man’s shopping can be and often is completed in five minutes, which is only less than a quarter ______.
A. of a woman’s
B. that of a woman’s
C. of that of a woman
D. of a woman
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