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问题

Fighting an artificial greenhouse effect seems to be the greatest of environmental challenges, ________?

A:isn't it
B:does it
C:doesn't it
D:is it
正确答案是:
同类题型

22.How close parents are to their children ___________a great effect on the characters of the children

One hundred and ten thousand, two hundredand six is ________.

esult was not the same ________ the professor had expected, ________ was rather disappointing

Read it aloud _________ the whole class can hear you clearly.

The food smelt terrible but Tom _______ taste it.

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