They ______ in the beautiful music. [ ]

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问题选择题

A. forgot themselves

B. remembered himself

C. lost themselves

D. enjoyed herself

答案

答案：C

选择题

Little Bob is often educated by his parents to be good and friendly to anybody even if ________.[ ]

A. attacking

B. is attacked

C. to be attacked

D. attacked

填空题

影响二阶系统动态特性的参数是（）和（）。