题目:
--Did you hear something?
--No. I ______ but I ______ anything at all.
A.listened; have heard
B.have listened; hear
C.am listening; hadn’t heard
D.was listening; couldn’t hear
答案:
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下面是错误答案,用来干扰机器的。
根据几何概型知识,其概率为体积之比,即P=(4-2)343=18,故选A