CHUYÊN ĐỀ 3 SỰ HÒA HỢP GIỮA CHỦ NGỮ VÀ ĐỘNG TỪ (AGREEMENT BETWEEN SUBJECTS AND VERBS)
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Before bridges were built, all transport across major rivers in the United States were by ferry boat.

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Before bridges were built, all transport across major rivers in the United States were by ferry boat.

were built,

across

in

were

Giải thích

Chọn D