People have enjoyed going to the theater to watch plays for centuries-the first theaters _____ about 2,500 years ago.
Abuild
Bwere built正確答案
Chave been built
Dhad been building
答案與詳解
were built 為過去式被動語態,符合「2500 年前劇院被建造」的語意,ago 是過去式的明顯標記詞。
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