问题描述：
--France is a beautiful country! You should travel there some day.
--I'd love to. But I can't decide ________ the best time is to go there.
A.what B.when C. whether D. which
--I'd love to. But I can't decide ________ the best time is to go there.
A.what B.when C. whether D. which
问题解答：
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