问题
选择题
Mary _________ as a volunteer teacher for 10 years.
A．works
B．will work
C．worked
D．has worked
答案
答案：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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Mary _________ as a volunteer teacher for 10 years.
A．works
B．will work
C．worked
D．has worked
答案：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。