一What are you going to do this weekend?
一Well，we’ll clean up the city parks _______ it rains .
A．ifB．untilC．whileD．unless
D

試題分析：句意：----你這個(gè)周末打算去做什么？---我們將打掃城市公園，除非下雨。if如果；until直到；while正當(dāng)……時(shí)候；unless除非。因此，選D。
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