题文
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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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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