.By the time he comes back, I’m sure we ________ all these rooms of the lab. Therefore, he doesn’t have to return.A．have cleanedB．will be cleaningC．will hav-高中英语-n多题

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By the time he comes back, I’m sure we ________ all these rooms of the lab. Therefore, he doesn’t have to return.

A．have cleaned	B．will be cleaning
C．will have cleaned	D．have been cleaning

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◎ 解析

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◎ 知识点

根据n多题专家分析，试题“.By the time he comes back, I’m sure we ________ all these rooms of the lab. Therefore, he doesn’t have to return.A．have cleanedB．will be cleaningC．will hav…”主要考查了你对【可数名词及其单复数】，【动名词】，【表语从句】，【缩写与简写】等知识点的理解和应用能力。关于这些知识点的“档案”，你可以点击相应的链接进行查看和学习。

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