【題目】It is difficult for any of us to eat better, exercise more, and sleep enough, ______ we know we should.

A. because B. even if

C. unless D. before

【答案】B

【解析】句意：對(duì)于我們?nèi)魏稳藖?lái)說(shuō)，吃好點(diǎn)兒，多運(yùn)動(dòng)點(diǎn)兒，睡足點(diǎn)兒是困難的，即使我們懂得應(yīng)該那么做。此題考查讓步狀語(yǔ)從句的連接詞。because因?yàn)椋龑?dǎo)原因狀語(yǔ)從句; even if即使，引導(dǎo)讓步狀語(yǔ)從句; unless除非，引導(dǎo)條件狀語(yǔ)從句; before 在……之前,引導(dǎo)時(shí)間狀語(yǔ)從句。

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