A recent poll of elected officials suggests that candidates,when in the midst of tough compaign, oftem make statements about an opponent that they may not think is true. (划线部分是最后这个is)
a: is
b:are
c:to be
d
f as
e: it is
答案选b,想不明白为什么啊? 先谢谢。
-- by 会员 Crispblue (2012/8/2 11:35:20)