问题

Li Na went out of the China Open in the first round. Why should she be defeated by suchan unknown player?— Well, that’s OK. She __________ enough after becoming the world champion. [ ]

A: could not train
B: must not have trained
C: can not train
D: may not have trained

正确答案是：

同类题型

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you ever been to the Summer Palace— I can’t quite remember. _______, it might have been during my childhood.