单项选择题

It was not______I saw Helen the next morning______I felt relieved.

A. until; that
B. when; that
C. until; when
D. when; then
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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
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
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