单项选择题

______ quite recently, most mothers in Britain did not take paid work outside the home.

A. Before
B. Until
C. From
D. Since
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单项选择题
Tom ______ home because no one answered the phone.
A. must have left
B. can have left
C. should have left
D. may have left
单项选择题
______ carefully, it will last at least about five years.
A. Using
B. To use
C. Used
D. Use
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