单选题：Theexpression"playsafe"probablymeans.

题目内容：

Theexpression"playsafe"probablymeans. A．towritecarefully
B．todoasteacherssay
C．tousedictionariesfrequently
D．toavoidusingwordsoneisnotsureof

参考答案：

答案解析：

Thereisnospecificrule_whatweshouldweartoadinnerparty.

Thereisnospecificrule_whatweshouldweartoadinnerparty.A．becauseof B．asto C．asof D

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You'dbettertakeanumbrellawithyouitrains.A．nevertheless B．although C．incase D．sot

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We'llvisitEuropenextyear_wehaveenoughmoney.A．lest B．until C．unless D．provided

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