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问题: 急求~英语小选择〈8

My pain ______obvious the momment I entered the office ,for the first manI met asked pitifully
"Are you feeling all right?"

A.could be B could have been
C,must be D must have been

解答:

答案选D.

must have done表示对过去事件的肯定性猜测,而could have done只能用于否定句和疑问句中,表示对过去事件的否定性或疑问性猜测.

根据后文和题意,从他人的问句可知,"我的疼痛"一定是很明显的,所以得出答案.