_______ you start, you should go ahead.
A．OnceB．BeforeC．UntilD．Though
A

試題分析：句意：一旦你開始，你就應(yīng)該繼續(xù)。once一旦；before在……以前；until直到……才；though雖然，盡管。根據(jù)句意故選A。
點評：本題難度適中。連詞是近幾年高考的熱點，主要考查從句中的連詞所作的成分，它們的區(qū)別及意義。需要考生會正確分析復(fù)雜的句子結(jié)構(gòu)的能力，能夠正確理解語境。這里考生容易誤選D。
即學(xué)即練：All the dishes in this menu,_________ otherwise stated, will serve two to three people.
A. as        B. if      C. though       D. unless
解析：D。句意：除非有特別的說明，要不然這個菜單上的所有的菜只供兩到三個人食用。unless表示“如果不……，除非……”，符合句意。
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