【題目】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

【答案】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(xué)家去過的地方應(yīng)該是指在當(dāng)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(shí)，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(xué)家曾經(jīng)去過了許多當(dāng)時人口發(fā)展速度遠(yuǎn)超過農(nóng)作物生產(chǎn)速度的地方。故選A

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