20. To prevent sewage from entering the waterways and protect public health, the city councilman strongly demanded that the sewage system _________ in three months.
(A)improved
(B)to improve
(C)was improved
(D)be improved
詳解 (共 2 筆)
未解鎖
demand that (should)...
未解鎖
為了防止污水進入水道並保護公眾健康，市議...
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