Question

I don't think you can work out the maths problem________ the

I don't think you can work out the maths problem________ the
teacher's help.
A．since
B．unless
C．because
D．without
【精析与答案】 D选B为什么不行

Answer 1

解：该句意为我不信你能在没有老师帮助下做出这题。跟据汉语意思此处填without，若填unless，则意为我不信你能做出这题除非老师的帮助，意思不附和题意。

Answer 2

unless是指除非，有条件意味。而without是指没有...的话。

Answer 3

D

Answer 4

unless 后面应该跟从句。