. ___ to nuclear radiation, even for a short time may produce variants（变异体）of genes in human bodies.
| A．Being exposed | B．Having exposed |
| C．Exposed | D．After being exposed |
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. ___ to nuclear radiation, even for a short time may produce variants（变异体）of genes in human bodies.
| A．Being exposed | B．Having exposed |
| C．Exposed | D．After being exposed |
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