单项选择题

A) produced C) brought
B) obtained D) taken

A．produced
B．obtained
C．brought
D．taken
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单项选择题
A) be taken C) coverB) be carried D) recover
A．be taken
B．be carried
C．cover
D．recover
单项选择题
A) and floated C) and floatingB) floated D) to float
A．and floated
B．floated
C．and floating
D．to float
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