40. A series of experiments to test the new drug _______ carried out, but so far it still can’t prove to be an
effective drug.
(A) was
(B) were
(C) has been
(D) have been
詳解 (共 3 筆)
未解鎖
A series of experi...
未解鎖
A series of有單複數的用法 ...
未解鎖
「A series of」作為主語時,動...
私人筆記 (共 5 筆)
未解鎖
A series of experime...
未解鎖
CCChen解題說明: 最佳選項是C ...
未解鎖
A series of experim...
未解鎖
A series of experime...
未解鎖
解析 a series of + 複...