1.I ordered two teas, which _?_ soon brought to my table.(was, were)2.A series of grammar exercises _?_ been prepared for the students.(has, have)3.Every means _?_ been tried to find out the cause of the trouble.(has, have)
热心网友
1.were/ which指代two 动词用复数.2.has/ A series of 一系列的..../ 动词一定用单数.3.has/ 主语中含有every,所以动词必须用单数.
热心网友
werehavehas
热心网友
was havehas