单项选择题

He had a bad cold. （） is why he didn’t come.

A. It
B. This
C. That
D. What

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单项选择题

She remembered several occasions in the past （） she had experienced a similar feeling.

A. which
B. before
C. that
D. when

单项选择题

We grow all our own fruit and vegetables, （） saves money, of course.

A. which
B. as
C. that
D. what

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