问题补充：
The reason I’m writing to you is to tell you about a party on Saturday.
A. because
B. why
C. how
D. which
答案：
A. because
(答案→)B. why
C. how
D. which
解析：本题考查定语从句。先行词为the reason在定语从句I’m writing to you中作原因状语，故用why，选B。
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