Despite other scientists' __________ of interest, Fleming kept trying to develop the chemical __________ it would be safe and effective.
| A．lack； so as to |
| B．lacking； so as to |
| C．lack； so that |
| D．to lack； so that |
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Despite other scientists' __________ of interest, Fleming kept trying to develop the chemical __________ it would be safe and effective.
| A．lack； so as to |
| B．lacking； so as to |
| C．lack； so that |
| D．to lack； so that |
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