It is essential that all these features______twice.

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问题 It is essential that all these features______twice.

选项 A、being checked
B、are checked
C、checked
D、be checked

答案D

解析

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本试题收录于：英语题库成考专升本分类

英语

成考专升本

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It is essential that all these features______twice.

英语

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