I cleaned my classroom(A with three hours Bthree hours ago C in three hours D three hours before)如上

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I cleaned my classroom(A with three hours Bthree hours ago C in three hours D three hours before)如上

I cleaned my classroom(A with three hours Bthree hours ago C in three hours D three hours before)如上
I cleaned my classroom(A with three hours Bthree hours ago C in three hours D three hours before)
如上

I cleaned my classroom(A with three hours Bthree hours ago C in three hours D three hours before)如上
B

B:cleaned为过去时,因选用过去时态 D选项用法错误 C:在三个小时以内 A:不表时间 答案为B