阿摩線上測驗
18. Some people have a habit _________ their teeth while they are asleep.
(A) of grounding
(B) of grinding
(C) to ground
(D) grounding
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統計： A(47), B(293), C(18), D(42), E(0) #1801834
統計： A(47), B(293), C(18), D(42), E(0) #1801834
