单选题：Youshouldnottouchitifyouarenotsureitissecureenough.

题目内容：

Youshouldnottouchitifyouarenotsureitissecureenough. A．clean
B．pretty
C．distant
D．safe

参考答案：

答案解析：

Theydidn'trealizehowserioustheproblemwas.

Theydidn'trealizehowserioustheproblemwas. A．know B．forget C．doubt D．remember

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