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问题

Nowadays scientists are working hard to find out ______ to do with air pollution.

A:how
B:why
C:when
D:what;
正确答案是:
同类题型

The shop assistant was dismissed as she was_______of cheating customers’.

— Hello, I _____ to ask if I can book two tickets for tonight’s film. — Sorry, we’ve already sold out. [ ]

Last year, he didn’t know how ___________ a model robot.

Much to my surprise, she _________ tears __________ she read the letter.

NovakDjokovicwonthe2012AustraliaOpen,____ RafaelNadalonJanuary29,2012,afterahardmatch. [ ]

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