Question

---You did not wait for Mr.Black last night,did you? ---Yes,

---You did not wait for Mr.Black last night,did you? ---Yes,but we __ .he did not return home at allA.must not B.need not C.would not D.should not have

Answer 1

D
问句的意思是，你们昨晚没有等Black回来，对吗？ -我们等了，但是我们______。（因为）他昨晚根本没有回家
所以填should not have 意即 本不应该等的

Answer 2

D.shouldn`t have本来不该等待，因为他根本没有回家，可是我们却等了。