A student is (allowed) to (enter into) this room (only if) a teacher (has) given permission.

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问题 A student is (allowed) to (enter into) this room (only if) a teacher (has) given permission.

选项 A、allowed
B、enter into
C、only if
D、has

答案B

解析 enter(进入)是及物动词,后面可以直接加名词,应把into去掉。
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