单项选择题

He complied with the requirement that all graduate students in education ______ a thesis.

A. write

B. writing
C. to write
D. be writing
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单项选择题
I ______ my breakfast when the morning post came.
A. had



B. had been having
C. have been having

D. was having
单项选择题
Just as the builder is skilled in the handling of his bricks, ______ is the experienced writer in the handling of his words.
A. so

B. as
C. thus

D. equally
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