－How did it that the secretary knew where we were?－Maybe he had been following us.A. come

问题补充：

－How did it that the secretary knew where we were?

－Maybe he had been following us.

A. come about

B. come across

C. come off

D. come round

答案：

(答案→)A. come about

B. come across

C. come off

D. come round

解析：考察动词短语辨析。A形成，产生，发生；B遇见，发现；C成功；戒除；D苏醒，周而复始；句意：—那个秘书怎么会知道我们在的地方的？—也许他一直都在跟踪我们。根据句意说明本句中的come about表示发生，产生；故A正确。