单选题 It is only by studying history ______ we can learn what to expect in the future.
  • A. and then
  • B. by which
  • C. through which
  • D. that
【正确答案】 D
【答案解析】[解析] 根据题意，这是一个强调句型：it is by...that...，意为通过……才能……，因此答案为D。译文：只有通过学习历史，我们才能知道未来可以期待什么。