题目内容

Sometimes new ideas have to be tested many times before ______ .

A. accepting fully
B. being fully accepted
C. fully accepting
D. fully being accepted

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The government forbids ______ such bad books.

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简述楼梯的组成及各部分作用。

一个楼梯段的踏步数要求最多不超过（）级，最少不少于（）级。

A. 16，2
B. 18，3
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D. 18，2