---What are you going to do this weekend ?
--- Well, we’ll clean up the city parks ________ it rains..

A．if  B．until  C．while  D．unless 

D

解析試題分析：if是否，如果；until直到；while然而，當(dāng)……時(shí)；unless除非，如果不。句意：這個(gè)周末你打算做什么？——哦，如果不下雨，我們要打掃市內(nèi)的公園。結(jié)合語境可知選D。
考點(diǎn)：考查連詞

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