单项选择题

There was nothing they could do ______.

A. but to wait
B. only to wait
C. but wait
D. unless they waited
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单项选择题
When Mr. Black retired, his son______the business.
A. took up
B. took over
C. took on
D. took out
单项选择题
He never wrote to his father______ he was in need of money.
A. except
B. except when
C. except for
D. except that
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