【题目】Don't be so anxious about that. Helen________a note.
A．may leave
B．should leave
C．might have left
D．can have left
在线课程【答案】C
【解析】由前面的语境可知，后一句表示“Helen可能留了一个条子”，故C项正确，can表示推测时不用于肯定句中。
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