—Did you notice John was not at work today?
—No.If _______ working,I would have noticed it.
A．I’dB．I was
C．I’d beenD．I were?
C?
從“Did you notice” 可知下面的回答是針對過去情況的假設(shè)，用過去完成時，即I’d been相當(dāng)于I had been。
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