题文
Nowadays people are convinced ___ the negative effect of second-hand smoking ___ people around.
| A．of; at | B．by; in |
| C．of; on | D．on; at |
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Nowadays people are convinced ___ the negative effect of second-hand smoking ___ people around.
| A．of; at | B．by; in |
| C．of; on | D．on; at |
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