We carefully, but we didn’t anything.

A. listened; heard B. listened; hear

C. listen; heard D. listen; hear


B  由后半句中的didn’t可知前半句也用一般過(guò)去時(shí)，故排除C、D兩項(xiàng)；didn’t后接動(dòng)詞原形，又排除A項(xiàng)。故選B項(xiàng)。


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