阿摩線上測驗
9. Peter is a very nice boy. He always helps his parents with the housework. Last Sunday, he_____ to mop the floor for his mother.
(A) criticized
(B) imagined
(C) produced
(D) volunteered
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統計： A(0), B(0), C(0), D(5), E(0) #3389650
統計： A(0), B(0), C(0), D(5), E(0) #3389650
