2道英语选择题.weshouldgiveahandtoblindwhentheyneedanyhelpinlife,A.aB.anC.theD./Thereisasign"NoSmoking!"Westopthemfromsmoking.A.needB.mustC.areabletoD.havetoBD选什么.有什么区别主观和客观

Question

2道英语选择题.
we should give a hand to ____ blind when they need any help in life,
A.a B.an C.the D./
There is a sign "No Smoking!" We _____ stop them from smoking.
A.need B.must C.are able to D.have to
B D选什么.有什么区别 主观和客观?

Answer 1

C
D
must 必须做某事
have to 不得不做某事,表示挺被动的意思