摘要： It is no longer a question man is learning more and more about space. A. whether B. that C. if D. how
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It is no longer a question ________ man is learning more and more about space.
- A.whether
- B.that
- C.if
- D.how
It is no longer a question _____ man is learning more and more about space .
A．whether B．that C．if D．how
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It is no longer a question ________ man is learning more and more about space．
[ ]
A．whether
B．that
C．if
D．how