单项选择题

PO to be understood B) understanding C) to understand D) being understood
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单项选择题
A．in undergroundB．below undergroundC．undergroundD．undergroundly
A．in underground
B．below underground
C．underground
D．undergroundly
单项选择题
A．evaporatingB．being evaporatedC．having been evaporatedD．being evaporated
A．evaporating
B．being evaporated
C．having been evaporated
D．being evaporated
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