单项选择题

As the recovery builds speed, it is likely to be sustained by a ______ circle of forces.

A. vicious
B. rotating
C. virtuous
D. spiral
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单项选择题
DVDs are more common now than the VHS-type videotapes that were once so ______ in watching movies at home.
A. prevalent
B. leading
C. foremost
D. habitual
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