问题补充:
David said that it was because of his strong interest in literature he chose the course.
A. that
B. what
C. why
D. how
答案:
(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。