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To battle world hunger, the great scientist once traveled to many places where populations _______ faster than crop production at that time.

A. expanded B. were expanding

C. has expanded D. would expand

A

【解析】

試題分析:考查時態(tài)。由once和at that time可知用過去時態(tài),科學家去過的地方應該是指在當時那些地方的人口處于快速發(fā)展階段,只是在那時的一般事實,故用一般過去時即可。句意:為了與世界饑荒作斗爭,這位偉大的科學家曾經(jīng)去過了許多當時人口發(fā)展速度遠超過農(nóng)作物生產(chǎn)速度的地方。故選A

考點:考查時態(tài)

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