These problems, ________ will seriously affect the growth of teenagers and even the nation’s future.
| A．not if solved properly | B．if solved properly | C．not if properly solved | D．if not solved properly |
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These problems, ________ will seriously affect the growth of teenagers and even the nation’s future.
| A．not if solved properly | B．if solved properly | C．not if properly solved | D．if not solved properly |
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