单项选择题

If the law and order______, neither the citizen nor his property is safe.

A. is not preserved
B. are not preserved
C. were not preserved
D. have not been preserved
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单项选择题
______the 1990's______discourse analysis came into being in the West.
A. It is until; that
B. It is not until; when
C. It was not until; then
D. It was not until; that
单项选择题
______the jungle did he realize that there was danger everywhere in it.
A. Upon entering
B. When he entered
C. Only after entering
D. After he had entered
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