33、The little boy showed great interest __________ chemistry when he was doing the experiment __________ the first time.

A. in; for      B. on; for      C. in; on       D. for; at

33、A

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The little boy showed great interest __________ chemistry when he was doing the experiment __________ the first time.

A. in; for      B. on; for      C. in; on       D. for; at

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