问题
选择题
—Did you notice John was not at work today?
—No.If _______ working,I would have noticed it.
A．I’d
B．I was
C．I’d been
D．I were
答案
C
从“Did you notice” 可知下面的回答是针对过去情况的假设，用过去完成时，即I’d been相当于I had been。
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