-- hurry mum the bus is coming -- wait a minute dear you --- cross the street until the traffic li-- hurry mum the bus is coming -- wait a minute dear you --- cross the street until the traffic lights are greena\ mustb\ needc\ must notd\ need not说

-- hurry mum the bus is coming -- wait a minute dear you --- cross the street until the traffic li
-- hurry mum the bus is coming
-- wait a minute dear you --- cross the street until the traffic lights are green
a\ must
b\ need
c\ must not
d\ need not
说理由!

正确的答案是 C.
you must not = 你不能,千万不要
you must not cross the street until the traffic lights are green
直到交通灯是绿色,你千万不要过马路