英语选择，15.17选BD的原因是什么？18题为什么不选C？
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15. 在"It is important (strange，natural，necessary)that…"这类句型里，that所引导的主语从句中的谓语动词常用 “should十动词原形”结构，表示某事是"重要"、"奇怪"、"自然"、"必要"等意义。should 可省略。如:
It is important that every member (should) inform himself of these rules. 重要的是每个成员知道这些规则。
17.虚拟语气，由于be away 发生在felt as if前，故用过去完成
18.在would rather,had rather等后的宾从中谓语动词应用过去时或过去完成时。如：
I would rather you were not here. I'd rather you had been present.
It is important that every member (should) inform himself of these rules. 重要的是每个成员知道这些规则。
17.虚拟语气，由于be away 发生在felt as if前，故用过去完成
18.在would rather,had rather等后的宾从中谓语动词应用过去时或过去完成时。如：
I would rather you were not here. I'd rather you had been present.
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18题为啥选D
在did后面加个do？
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