David said that it was his strong interest in literature he chose the course.A. because of

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(答案→)A. because of; that
B. because; so
C. because; that
D. why; because
解析：考查强调句：强调句的结构是：It is/was+强调部分+that+其余部分…，这里强调的是原因，his strong interest是名词，第一空用because of，去掉强调结构这句话还是可以成立，所以是强调句，第二空填that，David说因为他对文学非常有兴趣他选了那个课程。选A。