题干
—Must he finish the work before lunch?
— ___________. He can do it in the afternoon.
A：Yes, he must.
B：No, he mustn't.
C：No, he needn't.
答案(点此获取答案解析）
C
—Must he finish the work before lunch?
— ___________. He can do it in the afternoon.
A：Yes, he must.
B：No, he mustn't.
C：No, he needn't.
周期开始计时，则图乙描述的是( )
