问题
选择题
Look! Tom is too sleepy to work．He _______ up watching TV．
A．mustn’t have stayed
B．shouldn’t have stayed
C．mustn’t stay
D．ought not to say．
答案
答案：B
从上句Look! Tom is too sleepy to work．说明他本不该熬夜看电视，而实际上是熬夜导致太困了。shouldn’t have done是“本不该做…而实际上却做了”。