【題目】Please take the medicine three times a day, ____ it won’t work well.

A.andB.butC.orD.unless

【答案】C

【解析】

句意：請(qǐng)一天服3次藥，否則效果不佳。

考查連詞辨析。A. and（并且，表示順承）； B. but（但是，表示轉(zhuǎn)折）；C. or（或者，表示選擇；或用于句型祈使句+or+陳述句”中，表示在以祈使句為條件下的相反假設(shè)，意為“否則，要不然”）；D. unless（ unless 除非，表示條件，引導(dǎo)條件狀語(yǔ)從句）；根據(jù)“Please take the medicine three times a day” 是祈使句，推斷空格用or表是相反的假設(shè)“否則效果不佳”；故選C。

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