問題詳情

24. Use the medicine that _______________ and found to be safe.
(A)tested
(B) have been tested
(C) has tested
(D) has been tested

參考答案

答案:D
難度:簡單0.8
書單:沒有書單,新增

用户評論

!大藍】評論

has been tested........

BlueW】評論

has been tested.....★★★★★★,...