【題目】Is health important to us? Yes, but many of us never understand it ________ they fall ill.

A. untilB. sinceC. whileD. after

【答案】A

【解析】

句意:健康對我們重要嗎?是的,但是我們很多人直到生病了才明白這件事。until 直到時候;since自從;while當(dāng)時候;after之后。根據(jù)句意可知,這句話中使用了句型not(never) ….until…,意為“直到時候,才”,故應(yīng)選A。

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