单项选择题

The word "poem" is concrete, () "poetry" is abstract.

A. when
B. as
C. while
D. since

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单项选择题
She found herself () forward more and more eagerly to the holiday at home.

A. looking
B. bringing
C. desiring
D. expecting
单项选择题
The students are busy () the examination.

A. preparing for
B. preparing
C. to prepare
D. to prepare for
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