问题
选择题
—You didn’t wait for Mr. Black last night, did you?
—No, but we ____. He didn’t return home at all.
A．couldn’t have
B．needn’t have
C．didn’t need to
D．should wait have
答案
C
考查情态动词。根据语境“No”可知“我们没有等”。根据“He didn’t return home at all.”说明“我们不必等。”而B项表示已等过。