Over the past 40 years, 29 other Chinese people ____ Mount Qomolangma successfully.
A．climbedB．have climbedC．had climbedD．climb
B
根據(jù)時(shí)間狀語(yǔ)在過(guò)去的四十年里，可知句子為現(xiàn)在完成時(shí)態(tài)，故選B。
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