单项选择题

could go on but I am too busy ______ any more time to this.

A. to donate
B. donating
C. donated
D. donation
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单项选择题
People began to conserve energy ______ largely to the hike in raw material prices last year.
A. according
B. attempt
C. due
D. need
单项选择题
The firm has seen considerable changes after he ______ to be the director of the business division.
A. elect
B. to elect
C. was elected
D. elected
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