【題目】A cough is usually nothing to worry about unless it lasts for ten days ___.

A.or moreB.insteadC.at mostD.only

【答案】A

【解析】

考查比較級(jí)。句意:咳嗽如果持續(xù)十天或者十天以上,就要引起注意。A. or more 或者更多;B. instead而不是;C. at most至多; D. only僅僅。根據(jù)句意,故選A項(xiàng)。

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