摘要： certain that his invention will lead to the development of production. A．That is B．This is C．It is D．It has
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37.________________certain that his invention will lead to the development of production.
|
A．That's |
B．This is |
C．It's |
D．What's |
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37.________________certain that his invention will lead to the development of production.
| A．That's | B．This is | C．It's | D．What's |
________ certain that his invention will lead to the development of production.
[ ]
A．That's
B．This is
C．It's
D．What's