问题

From time to time a crocodile has snatchedsomeone _______ he or she is even aware that the crocodile is there.

A:when
B:until
C:since
D:before

正确答案是：

同类题型

When you rewrite the paragraph, I advise you to leaveout __________ is thought unnecessary or misleading.

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Jack,you’re so lazy!This jobhours ago.

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