问题

Whatever is left over may be put into the refrigerator，________ it will keep for two or three weeks.(2011·安徽)

A:when
B:which
C:where
D:while

正确答案是：

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govcn, which has _____foodand drug channel with clear explanations, is _____very popular website

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下面加点词语用法与其他三项不同的一项是

our elder brotherreturned from Africa yet– Yes, but he _________ here foronly three days before his company sent him to Australia.

It’s important for the figuresregularly