“ Although ,” the boy said , “ _______ over and over , the maths problem remained confusing to me ” .
| A．explained | B．explain |
| C．explaining | D．having explained |
She sat there without her shoes on, ________.
| A．watching | B．watched | C．looking | D．looked |
______ the windows ______ the pictures of different styles.
| A．Among; hang | B．Between; hanged | C．Among; hanging | D．Between; hang |
________ several years he has been working like this.
| A．In | B．After | C．For | D．Since |
– Are you married?
--No, still______.
| A．one | B．single | C．separate | D．myself. |
_________ surprise you have brought us!
| A．What a | B．What | C．How a | D．How |