题目内容：
At the Mayan ruins, we imagined what it（ ） like 1,300 years ago when 30,000 people lived here.
A．must have been B．must be
C．should have been
D．should be
参考答案：
答案解析：
单选题：At the Mayan ruins, we imagined what it（ ） like 1,300 years
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B．must be
C．should have been
D．should be