____ this may sound like a simple process, great care is needed．
A．SinceB．OnceC．AlthoughD．Unless
C
本題考查連詞。Since既然；once一旦；although盡管；unless除非。根據(jù)句意：盡管這也許聽起來(lái)是一個(gè)簡(jiǎn)單的過(guò)程，但需要小心翼翼。
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