单项选择题

E-mail as well as telephones______more and more popular in daily communica-tion.

A. have become
B. become
C. are becoming
D. is becoming
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单项选择题
The purpose of new technologies is to make our life easier, ______it more diffi-cult.
A. not make
B. not to make
C. not making
D. do not make
单项选择题
Nobody in the class except you and me______to the principal about the air quality problems.
A. has complained

B. have complained
C. complain

D. complaining
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