填空题

The room is in a terrible mess, so it__________(肯定没有打扫过).

【参考答案】

can’t have been cleaned
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填空题
Green architectures can reduce expenditure on the maintenance by______.
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As is explained in the passage, snapshots refers to______.
A．pictures taken at random
B．the shooting of birds by hunters
C．the whole process of taking pictures
D．pictures that were taken after careful preparation
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