Only when we have weighted all the factors involved ______ decide when would be the best time to start.

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问题 Only when we have weighted all the factors involved ______ decide when would be the best time to start.

选项 A、did we
B、we did
C、can we
D、we can

答案C

解析 考查倒装结构。only作状语位于句首时,通常用倒装语序。在倒装的A和C选项中,A项时态不对,由此可见,选项C为正确答案。
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