You don’t know how difficult the job is,           you have done it yourself.
A．unlessB．sinceC．ifD．because
A

試題分析：句意：你不知道這項(xiàng)工作有多么難，除非你親自做了。A除非，如果不，B自從C如果D因?yàn)�，根�?jù)句意故選A
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