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问题

They were surprised that a four-year-old boy should work out such a difficult problem ____ they themselves couldn’t

A:once
B:then
C:while
D:if
正确答案是:
同类题型

Most Brazilians get along well with each other, _________ they are from different races(种族), including Americans, European settlers, and Africans,.

The good news we were looking forward inthe end

Turn on the blender about two minutes.

Every year, a great many visitors come to visit the temple dating from the l2th century, has brought a large income.

I was told that by 1990 things werebeginning to improve, _________ quickly enough.

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