--"I bought this shirt for 35 yuan yesterday." --"It’s on sale today for onlyYou

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问题 --"I bought this shirt for 35 yuan yesterday." --"It’s on sale today for onlyYou should have waited." --" Oh, really? But how _________ I know."

选项 A、could
B、did
C、can
D、do

答案 A

解析情态助动词CAN的过去式COULD，用于表示不确定，婉转或谦虚的态度。例如：You could at least have met me at the station．你起码应该到车站接一下我。

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