单项选择题

______ all his efforts to get that job ended up with failure.

A. Hard did as he try


B. Hard as he tried
C. As hard he tried


D. Hard as did he try
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单项选择题
All the elements of this problem must be addressed together （） none of them will be solved at all.

A. or
B. and
C. but
D. thus
单项选择题
All the files ______ before the meeting began.
A. have been prepared


B. were prepared
C. had been prepared


D. had prepared
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