Who ______how many offices we have contacted for the survey?

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问题 Who ______how many offices we have contacted for the survey?

选项 A、knows
B、know
C、is knowing
D、are knowing

答案A

解析 Third-person present tense is required. Choice (B) does not agree with who. Choices (C) and (D) are continuous forms, which are rarely used with stative verbs.  
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