—Why weren’t you at the meeting?
—I____ for a long distance call from my sister in America.
| A．was waited | B．was waiting | C．has waited | D．have been waiting |
---- Look! Everything here is under construction.
---- Oh, has the building once ___ for exhibition been pulled down, too?
| A．having been built | B．being built | C．to be built | D．built |
Go on climbing to the top of the peak, and you will see all the____ hills.
| A．surround | B．surrounded | C．surrounding | D．being surrounded |
He will agree to do what you require____ him.
A. of B . from C for D. to
---- Tom came to work last Sunday, but no one has seen him since.
---- _____ he have had an accident?
| A．Must | B．Should | C．Might | D．Could |
I’ll go to your party___ you promise me that you will invite our class advisor.
| A．if only | B．only if | C．unless | D．since |