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______is known to us all, only the theory ______ on practice can be practical.
A．Which; baseB．Which; basedC．As; basedD．As; basing
C

試題分析：考察定語從句和固定搭配。本題第一空是非限制性定語從句，which引導的非限制性定語從句不能放在句首，as指代后面一句話的內容，在句中作主語。第二空是固定搭配be based on…以…為基礎。使用了based on practice來修飾名詞theory。句意：眾所周知，只有以事實為基礎的理論才是適用的。故C正確。
點評：非限定性定語從句起補充說明作用，缺少也不會影響全句的理解，在非限定性定語從句的前面往往有逗號隔開，如若將非限定性定語從句放在句子中間，起前后都需要用逗號隔開。需要注意 which引導的非限定性定語從句是用來說明前面整個句子的情況或主句的某一部分。 在非限定性定語從句中，關系詞不能用that。
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