Mrs. Green ______ for 30 years in this community by the time she resigns tomorrow.

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问题 Mrs. Green ______ for 30 years in this community by the time she resigns tomorrow.

选项 A、had served
B、has served
C、been served
D、will have served

答案D

解析 语法题。句子中出现了“for+一段时间”这一现在完成时的标志,但动作的完成“serve”,是在“tomorrow”这一将来时间,所以应用将来完成时态,故选D。
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