问题补充：
This is the reason I agree to it.
A. that
B. why
C. what
D. A and B
答案：
A. that
B. why
C. what
(答案→)D. A and B
解析：名词reason后多接why（定语从句），可接that（同位语从句），有时for（+代词引出定语从句）。
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