单选题
I was A
on the verge
of B
incurring
Mr. Rochester's wrath by not listening to his prohibitions, C
while
a ray once more shone almost D
imperceptibly
on the hallway wall and I heard his muffled step on the carpet.
A
B
C
D
【正确答案】
C
【答案解析】
解析：C应改为when。when意为“当……的时候”，此时when后的从句是用来说明前面主句动作发生的背景。
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