单项选择题

In the advanced course, students must take objective tests （） monthly intervals.

A.with
B.on
C.for
D.at

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单项选择题
My suggestion （） we should stick to our original plan was finally accepted.

A.which
B.what
C.that
D.whether
单项选择题
I had no idea about that accident （） my mother told me.

A.until
B.unless
C.except
D.if
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