相关考题
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单项选择题
Before she left on the trip, she（）hard.
A.had trained;
B.has trained
C.would trained -
单项选择题
A lecture hall is（）where students attend lectures.
A.that
B.one;
C.which -
单项选择题
I have lived here（）1997.
A.for
B.since
C.from
