题目内容
11．If you are not rich by the time you are 35，says Ma Yun，then you_____the opportunities of youth．（ ）| A． | are wasting | B． | wasted | C． | will waste | D． | have wasted |
分析 句意：马云说：如果到35岁你还不富裕，那么就白白浪费了青春年华．
解答 答案D A项是现在进行时；B项是一般过去时；C项是一般将来时；D项是现在完成时．由于by the time是现在完成时的时间标志．故选D项．
点评 考查动词的时态．做此类题目，只要根据时间状语或标志词选择合适的时态即可．
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