【題目】Mum often feels worried about _____________ enough sleep because she’s getting old.

A. without having B. not having C. don’t have D. doesn’t have

【答案】B

【解析】句意“媽媽總是擔(dān)心沒(méi)有足夠的睡眠，因?yàn)樗狭恕�。空前有介詞about，用doing形式，且to do/doing的否定形式，要在to do或doing前加not，根據(jù)句意，故選B。

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