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问题: 按要求改写句子

68.China will continue to __save_energy_and_cut_pollution__ this year.(划线提问)
______will China continue to______this year?
69.We must keep the air in the room clean.(改为被动语态)
The air in the room must _____ _____clean.
70.The bedroom looks nice,and it's comfortable________ ________.
71.He didn't tell me when we should meet tomorrow (改为简单句)
He didn't tell me ______ ______meet tomorrow.

解答:

68.What;do
69.be kept(被动语态,keep的过去分词是kept)
70.as well
71.until we(not···until··· 直到···才···)