When Mary saw _____ piles of plastic in the bin, _____ strong sense of responsibility made her stick to her recycling work．
| A．不填；不填 | B．不填; a | C．the ; a | D．the; the |
I was really anxious about you. You ______ home without a word.
| A．mustn’t have left | B．shouldn’t have left |
| C．couldn’t have left | D．needn’t have left |
Wilma became the first American woman to win three Olympic gold medals in track, ________ made her mother very proud.
| A．it | B．that | C．which | D．this |
She took her son, ran out of the house, _______ him in the car and drove quickly to the nearest doctor’s office.
| A．putting | B．put | C．to put | D．having put |
He has called several times this morning. _______, there is something very urgent.
| A．Really | B．Especially | C．Obviously | D．Terribly |
John talked with me for about an hour yesterday. Never _______ him talk so much.
| A．had I heard | B．did I hear | C．I had heard | D．I heard |