单选题
He has many pen-friends. No week passes he receives several letters.无
A、
that
B、
which
C、
than
D、
but
【正确答案】
D
【答案解析】
这句话中but是关系代词, 引导定语从句, 其意义相当于 that not/ who not, 这时它的主句往往带有not或no。
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