问题

_we sleep together or apart is oneof the biggest cultural differences, and only in western societies ____ thefeeling that babies should sleep apart from their parents

A:might havesaved
B:must have saved
C:should havesaved
D:could have saved

正确答案是：

同类题型

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think he’s determined that he won’t give in — see if you can get round the stubborn man.

are in the same class.

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