You can make a complaint to the local government ___ you are happy with the way they deal with the matter.
A．unless B．if C．once D．a(chǎn)s
A

試題分析：unless除非 if 如果once一旦 as當(dāng)…時(shí)，根據(jù)句意，你可以埋怨當(dāng)?shù)卣�，除非你�?duì)他們處理事情的方式滿意。故選A
點(diǎn)評(píng)：不同的連詞要放在上下文中進(jìn)行考查，要注意一詞多義，如as當(dāng)…時(shí)；盡管；由于；
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