______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(yǔ)從句和固定搭配。本題第一空是非限制性定語(yǔ)從句，which引導(dǎo)的非限制性定語(yǔ)從句不能放在句首，as指代后面一句話的內(nèi)容，在句中作主語(yǔ)。第二空是固定搭配be based on…以…為基礎(chǔ)。使用了based on practice來(lái)修飾名詞theory。句意：眾所周知，只有以事實(shí)為基礎(chǔ)的理論才是適用的。故C正確。
點(diǎn)評(píng)：非限定性定語(yǔ)從句起補(bǔ)充說(shuō)明作用，缺少也不會(huì)影響全句的理解，在非限定性定語(yǔ)從句的前面往往有逗號(hào)隔開，如若將非限定性定語(yǔ)從句放在句子中間，起前后都需要用逗號(hào)隔開。需要注意 which引導(dǎo)的非限定性定語(yǔ)從句是用來(lái)說(shuō)明前面整個(gè)句子的情況或主句的某一部分。 在非限定性定語(yǔ)從句中，關(guān)系詞不能用that。
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