Question

【题目】Not only he but also his parents (be) to the USA many times.

Answer 1

【答案】have been
【解析】Not only ...but also ...连接两主语时,根据邻近原则,谓语动词和离它近的主语保持一致.因此本句的谓语与his parents保持一致，根据many times可知用现在完成时，故填havebeen。