单项选择题

It has been ten years since she ______ a nurse.

A. is
B. has been
C. was
D. had been
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单项选择题
Not until the early years of the 19th century ______ know what heat is.
A. did man
B. man did
C. have man
D. man have
单项选择题
If I had time, I ______ French.
A. will study
B. would study
C. shall study
D. would have studied
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