单选题
Up to now,nothing__________Betty．1 want to know the reason__________he hasn’t written to me．
A、
has heard from；that
B、
was heard from；that
C、
has been heard from；why
D、
heard from；why
【正确答案】
C
【答案解析】
解析：up to now一般和现在完成时连用；reason后面的定语从句一般用why引导。
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