单项选择题

(African) elephants are larger, (fiercer), and (difficulter) to tame (than) Asian elephants.

A. African
B. fiercer
C. difficulter
D. than
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Nora hardly (never) misses (an) opportunity (to play) (in) the tennis tournaments.
A. never
B. an
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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
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