.
We won’t know how much food to buy until we decide how many people ________.
| A．were coming | B．are coming | C．have been coming | D．had come |
Steve is very strong and healthy. Strangely enough, he ____ have been infected by HINI virus.
A would B mustC shouldD might
. I can’t receive your phone call at 8 o’clock tomorrow, because I ____ the meeting.
A am attending B will attend C will be attendingD am to attend
Tom first met Lucy three years ago. She ____ as a teacher in a high school.
A has workedB was working C is working D had worked
The young lady stopped and looked around as if_____ whether she was being followed.
A seeing B to have seen C having seen D to see
--- Remember, Dad, Thomas Edison got bad grades in school, too.
--- Stay in your room until you’ve _____ the electric lamp.
A invented B discovered C made D imagined