托业考试

试题来源：托业-4
【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

参考答案：A
网考网解析：
Third-person present tense is required. Choice (B) does not agree with who. Choices (C) an... 查看试题解析出处>>