单项选择题


A．upset
B．created
C．discovered
D．invented
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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
单项选择题
A．becauseB．ifC．afterD．as
A．because
B．if
C．after
D．as
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