问题
选择题
—Linda, together with her parents, ______up the mess in the park at the moment.
—It’s meaningful to be a volunteer. Let’s join them.
A．is cleaning
B．are cleaning
C．has cleaned
D．have cleaned
答案
答案：A
此题考查主谓一致问题，her parents 是从属结构，真正的主语是Linda，故谓语动词用单数。