专四

单选题It's high time that you _______ working.

参考答案：C进入在线模考
【译文】我建议当所有的材料都准备好以后再开始实施那个计划。
 考查recommend的用法。I recommend that后面的从句谓语动词要用“should+动词原形”，should可以省略，故选C。

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