We'll go to the park ________ there is a heavy rain tomorrow.

A. unless B. since C. as soon as D. if

A 【解析】句意：如果明天沒有大雨，我們將去公園。A. unless除非，如果不； B. since自從，既然； C. as soon as一……就； D. if如果。根據(jù)We'll go to the park我們?nèi)ス珗@；所以空格后應(yīng)該是不下雨。故選A。
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