[題目] 文法問題

[hopeliu (阿翔)]

Upon hearing of the disaster

(a) the Red Cross sent aid at once
(b) the Red Cross aid was sent at once
(c) aid was sent at once by the Red Cross
(d) aid of the Red Cross was sent at once

請教這題，

答案是c，b為何錯？

謝謝大家

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