.
It was ______ the 19th century_____ heat was considered to be a form of energy.
| A．not until; that | B．until; that |
| C．not until; when | D．until; when |
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.
It was ______ the 19th century_____ heat was considered to be a form of energy.
| A．not until; that | B．until; that |
| C．not until; when | D．until; when |
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