---I find it very difficult to read _________novel you lent me last week.
---Yes. It’s necessary to have __________good knowledge of historyA.the；不填B.a；不填C.the;aD.a;a
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C解析主要测试冠词。考生可能以为第一空是特指对方上周所借给"我"的小说，故应填定冠词；第二空后面是抽象名词，为不可数名词，不填冠词，于是错选A。然而，此处knowledge之前须用不定冠词，have a good knowledge of意为"对……很了解"，是固定搭配，故正确