David said that it was because of his strong interest in literature he chose the course.
A. that
B. what
C. why
D. how
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(答案→)A. that
B. what
C. why
D. how
解析：A 考察强调句型。本句是强调句式: It was… that…；强调的是原因状语because of his strong interest in literature,故A正确。