题目：If the worldˊs supply of fuel ＿＿＿＿＿＿＿＿ evenly distributed, there ＿＿＿＿＿＿＿＿ be a sufficient amount everywhere for present use.
- A. is, will
- B. was, should have been
- C. were, would
- D. had been, would have been
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