单项选择题

Though it was late in the night, ______ he continued to work vigorously.

A. but
B. yet
C. and
D. that
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单项选择题
We were suddenly ______ when I was speaking to John on the phone.
A. hung
B. cut down
C. cut off
D. hung back
单项选择题
He is too weak to ______ his business.
A. do with
B. do without
C. do away with
D. do up
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