________ is no doubt that he will come here some day, but ________ is doubtful when he will come.
A.There; thereB.It; itC.There; itD.It; there在线课程C
解析:
导解:第一句为there be句型,主语是名词doubt;
第二句为it作形式主语,doubtful是形容词作表语.
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