Mary _________ as a volunteer teacher for 10 year
Mary_________asavolunteerteacherfor10years.A．worksB．willworkC．workedD．hasworked...
Mary _________ as a volunteer teacher for 10 years. A．works B．will work C．worked D．has worked
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| D |
| 根据时间状语for 10 years十年了，说明本句为现在完成时态，所以选D。 |
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