单项选择题

Dozens of scientific groups ail over the world have been ______ the goal of a practical and economic way to use sunlight to split water molecules.

A. pursuing
B. chasing
C. reaching
D. winning
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单项选择题
It is said that with more forests ______ huge quantities of good earth are being washed away.
A. being destroyed
B. destroyed
C. destroying
D. to destroy
单项选择题
George wasn't in class today. Professor Brown excused him ______.
A. from attending
B. of attending
C. to attend
D. attending
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