【題目】John promises to help his mum with housework________he is free today.

A.unlessB.thoughC.ifD.until

【答案】C

【解析】

句意:John答應(yīng)如果他今天有空的話,他會(huì)幫助媽媽做家務(wù)。

考查連詞辨析。unless除非,如果不;though盡管,雖然;if如果;until直到……時(shí)候。根據(jù)句意可知,空后表示做家務(wù)的條件,應(yīng)用if引導(dǎo)條件狀語從句,故選C。

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