—The window is dirty.
—I know. It ______ for weeks.
| A．hasn’t cleaned | B．didn’t clean |
| C．wasn’t cleaned | D．hasn’t been cleaned |
Health problems are closely connected with bad eating habits and aof exercise.
| A． | limit | B． | lack | C． | need | D． | demand |
Eric received training in computer for one year,he found a job in a big company.
| A． | after that | B． | after which |
| C． | after it | D． | after this |
I have been living in the United States for twenty years,but seldomso lonely as now.
| A． | have I felt | B． | I had felt | C． | I have felt | D． | had I felt |
-Have you handed in your schoolwork yet?
-Yes,I have.I guess itnow.
| A． | has graded | B． | is graded |
| C． | is being graded | D． | is grading |
Christmas is _______ special holiday when _______ whole family are supposed to get together.
| A．the;the | B．a;a | C．the;a | D．a;the |