9. It long before we the result of the experiment.A. will not be will knowB. is will kno

问题补充：

9. It long before we the result of the experiment.

A. will not be, will know

B. is, will know

C. will not be, know

D. is, know

答案：

A. will not be, will know

B. is, will know

(答案→)C. will not be, know

D. is, know

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