高一英语不懂请详细解答,谢谢!(2110:9:13)
Thestudentsare________teenagersbetween16and19.
A.almost
B.most
C.mostly
D.atmost
-Youneedn'tdoitrightnow,needyou?
-Yes,IamafraidI________.
A.need
B.needn't
C.must
D.mustn't