When __________ whether Chinese could develop their own missiles,
Qian Xuesen said Chinese could do anything that foreigners coulddo.
| A．asked | B．asking |
| C．to asked | D．having asked |
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When __________ whether Chinese could develop their own missiles,
Qian Xuesen said Chinese could do anything that foreigners coulddo.
| A．asked | B．asking |
| C．to asked | D．having asked |
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