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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

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Rita Liang 高三下 (2024/06/17)
A series of experiments to test the new drug _______ carried out, but so far it still can’t prove to be an effective drug. 一系列檢驗新藥的實驗已經完成，但目前為止仍不能證明是有效的藥。   (A) .....觀看完整全文，請先登入
3F
M 大三上 (2024/06/03)
[A series of experiments] to test the new drug _______ carried out, but so far it still can’t prove to be an effective drug.
此題的主詞是 A series of experiments, 是複數，正確答案應選(D)have been才對，請阿摩更正解答。
4F
Wei Kuo 小六下 (2024/06/15)

A series of有單複數的用★

★★★★★，...


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40. A series of experiments to test the ..-阿摩線上測驗