Only when you experience the bad earthquake taking place in Si Chuan the importance of life.
A. can you understand
B. are you understand
C. do you understand
D. did you understand
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(答案→)A. can you understand
B. are you understand
C. do you understand
D. did you understand
解析：考察only的倒装句和时态。Only倒装有两个条件。当only放在句首，且强调状语的时候，后面的主句使用部分倒装的形式。本题恰好符合这两个条件。句意：只有当你在体验了四川的地震的时候，你才能理解生命的重要性。故A正确。