【题目】Secretaries whose jobs mainly involve writing, ________ phone calls and receiving visitors usually work in offices.
A. answeringB. answer
C. having answeredD. to answer
在线课程【答案】A
【解析】
考查非谓语动词。句意：秘书的工作主要包括写作、接电话和接待客人，通常在办公室工作。分析句子结构可知，空处和writing, receiving的动作是并列关系，而having answering的动作发生在谓语动词work之前，与题意不符，故选A。