2. 外语
  3. All female employees are advised to be______ when entering and leaving the building after-hours due to a recent spate of attacks

All female employees are advised to be______ when entering and leaving the building after-hours due to a recent spate of attacks

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问题 All female employees are advised to be______ when entering and leaving the building after-hours due to a recent spate of attacks.
选项 A、caution
B、cautious
C、cautiously
D、cautiousness
答案B
解析 横线前有be，横线后有when引导的时间状语从句，因此横线处应填入名词或形容词作表语。若选名词，主句的语意不连贯，故选表示主语状态的形容词(B)cautious。
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