- 试题详情及答案解析
- After class, students ______ clean the chalk off the blackboard.
| A．was excepted to | B．are supposed to |
| C．are important to | D．was polite to |
- 答案：B
- 试题分析：句意：下课后，学生们应该把黑板上的粉笔字擦下来。A. was excepted to例外；B. are supposed to应该；C. are important to对……重要；D. was polite to对……有礼貌。结合句意，故选B
考点：考查短语辨析。