单项选择题

Under______ circumstances are visitors allowed to enter the Research and Development center.

A. none
B. no
C. any
D. all
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单项选择题
Mr. Walton's physical therapist recommended that he ______ the treatment until the swelling has gone down.
A. continue
B. continued
C. has continued
D. is continuing
单项选择题
The most successful investors are ______ who can evaluate the effects that strategic challenges will have on a company's stock price.
A. those
B. their
C. these
D. them
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