All tenants may access the building outside Of normal office hours by entering______the security door on the south side.

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问题 All tenants may access the building outside Of normal office hours by entering______the security door on the south side.

选项 A、on
B、upon
C、through
D、between

答案C

解析 enter表示:“进入”,the security door(安全门)是可通行的关口,因此最恰当的是(C)through(穿过,经过)。
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