20. I got up early this morning, but I ________ so because I was not on duty today.
| A．mustn’t have done | B．needn’t have done |
| C．didn’t need to do | D．can’t have done |
The bike hit the tree ______ I could get off.
A when B before C until D while
That evening ____Smiths sat before a bright fire and had___nice supper.
| A．X,a | B．the ,a | C．X,X | D．the,X |
The women carrying babies, get on the bus first ,________?
A will they B don’t you C will you D don’ t they
Don’t be _______ by products promising to make you lose weight quickly.
A taken off B taken out C taken away D taken in
_______ late in the afternoon, Bob turned off the alarm.
| A．To sleep | B．Sleeping | C．Sleep | D．Having slept |