Without the contribution of Qian Xuesen, China __________ such great achievements in space technology.
| A．wouldn't make |
| B．can't make |
| C．shouldn't have made |
| D．wouldn't have made |
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Without the contribution of Qian Xuesen, China __________ such great achievements in space technology.
| A．wouldn't make |
| B．can't make |
| C．shouldn't have made |
| D．wouldn't have made |
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