-- can we run across the road now -- no we --- we have to wait until the light turns greena\ need notb\ must notc\ could notd\ should not说理由!

-- can we run across the road now -- no we --- we have to wait until the light turns greena\ need notb\ must notc\ could notd\ should not说理由!
-- can we run across the road now -- no we --- we have to wait until the light turns green
a\ need not
b\ must not
c\ could not
d\ should not
说理由!

-- can we run across the road now -- no we --- we have to wait until the light turns greena\ need notb\ must notc\ could notd\ should not说理由!
选d.
--我们现在能跑过马路吗?
--不 我们不应该这样做 我们必须等到红绿灯变绿再过马路
a中need是需要的意思 从意思上来说“不需要这么做”和后面的“必须这么做”有重复 need表示一种需求语法上来说应该是need not to也就是need to do sth（从意思上即可排除）
b明显不对 must指的是被法律等严格规定的必须 含有义务性质 也可用在祈使句中命令口气 比如妈妈让你必须收拾屋子之类的...闯红灯是违反交规但是不至于坐牢也不会受到强硬的监管
c中could和can可互换 多指一种能力ability 能跑的话过马路还是没啥问题吧...
d就是should应该 这里是建议小伙伴不要闯红灯~
另外这道题中选项也可以全部换成缩写 比如should not换成shouldn't

B must not表禁止
我们现在能穿过马路吗？
——不，我们需要等到绿灯亮的时候