The reason Old French made contributions to Middle English is English borrowed many words from it.
A. why; because
B. that; because
C. why; that
D. that; that
网友回答
A. why; because
B. that; because
(答案→)C. why; that
D. that; that
解析：考察定语从句和宾语从句.根据先行词reason可知引导词用why,当句子中已有其他引导词时,后面引导词习惯用that,故选C.