单项选择题

Nora hardly (never) misses (an) opportunity (to play) (in) the tennis tournaments.

A. never
B. an
C. to play
D. in
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单项选择题
Mary (must be) over 30 (now); it's (about) time she (should get married).
A. must be
B. now
C. about
D. should get married
单项选择题
(The) veterinarian has (examined) several dogs, two of (those) are (believed) to be developing rabies.
A. The
B. examined
C. those
D. believed
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