B
The reason 后跟定语从句I'm writing,我写信的原因是.
如果是短语的话就跟for
reason 的固定句型：
The reason + why +定从+is that +.
The reason +for +短语+is that +.
That is because.
That is why.
The reason---I'm writing is that I want to tell you about a party on Saturday.
The reason---I'm writing is that I want to tell you about a party on Saturday.
A because B why C for D as
A because B why C for D as
英语人气：115 ℃时间：2019-09-25 13:57:22
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