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So far nothing _____ Tom. I want to know the reason _______ he hasn’t written to me.
A．heard from; why 　B．has been heard from; why
C．was heard from; thatD．has heard from; that
B
含有so far的句子應(yīng)該時(shí)現(xiàn)在完成時(shí)態(tài)；reason作先行詞，定與從句應(yīng)該用that引導(dǎo)。
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