单项选择题

The reason () they died was lack of medical care.

A. which
B. at which
C. in which
D. why

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单项选择题
Not once () your sentence correctly.

A. you have copied
B. did you have copied
C. have you copied
D. have you been copied
单项选择题
I want to use the same dictionary ______ was used yesterday.
A. which
B. who
C. what
D. as
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