单项选择题

John D. Rockefeller,（），owned 90 percent of all American oil refineries.

A. as still a young man
B. while still a young man
C. a young man however
D. in spite of a young man

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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. of attending
B. from attending
C. to attend
D. attending
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