问题补充：
----- It was a red light, William. You the car.
------- Sorry, I didn’t see it.
A. must stop
B. should stop
C. must have stopped
D. should have stopped
答案：
A. must stop
B. should stop
C. must have stopped
(答案→)D. should have stopped
解析：考察情态动词，根据it was 和I didn see it可知，该句是对过去的虚拟，所以排除AB。C意为一定做了某事 D意为本应当做某事
句意为，---当时是红灯，威廉，你本应当把车停住的。----对不起，我没看见。
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