【題目】My mother usually sleeps with the window open ______ it’s really cold.

A.ifB.becauseC.sinceD.unless

【答案】D

【解析】

句意:我媽媽通常開(kāi)著窗睡覺(jué),除非天氣真的很冷。

考查連詞辨析。A. if如果;B. because因?yàn)椋?/span>C. since自從;D. unless除非。根據(jù)題意,從前半句“我媽媽通常開(kāi)著窗睡覺(jué)”和后半句“天氣真的很冷”來(lái)看,這里需要一個(gè)表假設(shè)的連詞,結(jié)合選項(xiàng),unless可以引導(dǎo)一個(gè)表假設(shè)的條件狀語(yǔ)從句,意為“除非”,相當(dāng)于if not;故答案選D。

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