单项选择题

People under stress have performed ______ feats of strength, like lifting an automobile off an accident victim.

A. specific
B. extraordinary
C. abrupt
D. abnormal
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单项选择题
I ________ him the Christmas gift by mail because he came home during the Christmas holidays.
A. ought to have sent
B. couldn't have sent
C. must have sent
D. needn't have sent
单项选择题
Our boss, Mr. Thompson, ________ a raise in salary for ages, but nothing has happened yet.
A. was promising
B. has been promising
C. promised
D. has promised
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