单项选择题
The teacher has his students () a composition every other week.
A. to write
B. written
C. writing
D. write
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单项选择题
It was not until she has arrived home ______ remembered her appointment with the doctor
A. when she
B. that she
C. and she
D. she
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单项选择题
The most difficult thing to do is finding______.
A．enough textbooks for the Chinese programs
B．enough money for the Chinese programs
C．enough teachers for the Chinese programs
D．enough students for the Chinese programs
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