It never occurred to humans until the mid-1990s some animals can be cloned.
| A．where | B．that | C．when | D．what |
It is certain that the International Horticultural Exposition(世界园艺博览会) _____ in the year of 2011 in Xi’an will attract a lot of tourists.
A being held B held C will be heldD to be held
Go and study in your room, ____ it to me to do the dishwashing.
A Get B Remain C LeaveD Send
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