问题补充：
--- Can you wait for me for another two hours?
--- Sorry. Two hours too long, I will go without you.
A. are
B. has been
C. is
D. have been
答案：
A. are
B. has been
(答案→)C. is
D. have been
解析：句意：——你能在等我两个小时吗？——对不起。两个小时太长了。我不等你，先走了。表示时间，长度，高度，金钱的名词短语做主语时，看作是一个整体，谓语用单数形式。结合句意，两个小时实际上是长的，因此用一般现在时。故选C。
