Although he talked half an hour, he couldn't give us a good ________ of the reason why he did it.
A．idea
B．explanation
C．sense
D．understanding
B
選擇B。根據(jù)句意：他談了半個小時，但就那件事，仍未能給出一個合理解釋。
　　explain,名詞為explanation.
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