The little boy showed great interest chemistry when he was doing it the first time.A.in,forB.on,forC

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【题目】The little boy showed great interest________chemistry when he was doing it________the first time.
A.in；for
B.on；for
C.in；on
D.for；at

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【答案】A
【解析】show interest in“对……感兴趣”；for the first time“第一次”故选A。