2. 外语
  3. Since 1990, our customers ______with our service.

Since 1990, our customers ______with our service.

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问题 Since 1990, our customers ______with our service.
选项 A、are satisfied
B、have satisfied
C、have been satisfying
D、have been satisfied
答案D
解析 Have been satisfied is the passive form of the present perfect tense, which indicates an action that started in the past and continues to the present. Choice (A) is the present tense. Choice (B) is the present perfect (active form). Choice (C) is the present perfect continuous.  
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