It was only after he had read the papers Mr. Gross realized the task before him was difficult to complete.
| A．when | B．that | C．which | D．what |
— Linda hasn’t shown up yet.
— It’s strange. She ____.
| A．could | B．might | C．must have | D．should have |
David applied for the position three times ____ he finally got it.
| A．until | B．when | C．before | D．after |
Many questions have been answered by John. He must have previewed the lessons last night, ____ he?
| A．needn’t | B．hasn’t | C．didn’t | D．mustn’t |
Look, ____ fashionable clothes is she wearing that all the eyes are fixed on her!
| A．so | B．such | C．how | D．what |
We the problem for a long time, but we didn’t reach any agreement.
| A．argued | B．explained | C．shared | D．communicated |