单选题
Who ______how many offices we have contacted for the survey?
A、
(A) knows
B、
(B) know
C、
(C) is knowing
D、
(D) are knowing
【正确答案】
A
【答案解析】
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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