阿摩線上測驗
37. To prevent misuse by children, all the medicine _____ in the cupboard.
(A) must lock
(B) has to lock
(C) has locked
(D) must be locked
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統計： A(27), B(25), C(45), D(467), E(0) #2956442
統計： A(27), B(25), C(45), D(467), E(0) #2956442
