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

考點(diǎn)：考查時(shí)態(tài)

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