21. What does “if left unchecked” mean in the first paragraph?
(A) if not locked
(B) if none attended
(C) if left by itself
(D) if not to be restricted

答案：登入後查看
統計： A(12), B(71), C(29), D(221), E(0) #2431800

詳解 (共 1 筆)

#4238126
could have a severe ...
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