特殊句式the scientists know only when a great deal more information has been obtained,__ possible to plan a manned trip to Mars.A it will be B will it be C it is D is it

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特殊句式the scientists know only when a great deal more information has been obtained,__ possible to plan a manned trip to Mars.A it will be B will it be C it is D is it

特殊句式the scientists know only when a great deal more information has been obtained,__ possible to plan a manned trip to Mars.A it will be B will it be C it is D is it
特殊句式
the scientists know only when a great deal more information has been obtained,__ possible to plan a manned trip to Mars.
A it will be
B will it be
C it is
D is it

特殊句式the scientists know only when a great deal more information has been obtained,__ possible to plan a manned trip to Mars.A it will be B will it be C it is D is it
倒装句,因为前面的ONLY