单项选择题

Jack________ from home for two days now, and I am beginning to worry about his safety.

A. has been missing
B. has been missed
C. had been missing
D. was missed
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单项选择题
E-mail is a convenient, highly democratic informal medium for conveying messages that ______ well to human needs.
A. adheres
B. reflects
C. conforms D. satisfies
单项选择题
The sudden drop in temperature has greatly ______ the crops.
A. affected
B. effected
C. influenced
D. destroyed
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