问题
选择题
--- Oh, there is someone knocking at the door.
--- __________ must be your neighbour, Mrs Black.
A．There
B．She
C．He
D．It
答案
答案：D
题目分析：句意：上句，有人在敲门，下句，你定是你的邻居Mrs Black.在打电话或敲门是不能分辨对方是谁，我们用it来指代，故选D。
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