16. There was so much noise produced by the machine outside that the professor had to ______ his voice so that it would not ________.
| A．rise; be drowned | B．lift; drown | C．increase; drown | D．raise; be drowned |
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16. There was so much noise produced by the machine outside that the professor had to ______ his voice so that it would not ________.
| A．rise; be drowned | B．lift; drown | C．increase; drown | D．raise; be drowned |
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