请教04-10-33

xuli_123

33. Seismic waves generated by an earthquake or large explosion can be recorded thousands of kilometer from their source.

答案： D

分析：用复数kilometers e.g. 10 hours

觉得C好象也不对

be recorded 后面可以直接接宾语吗?还是我理解有错?

谢了先.