—I'm afraid we can't work out the math problem________the teacher helps us.
—That's true. It's too difficult.
- A.if
- B.unless
- C.because
- D.as soon as
正确答案及解析
正确答案
B
解析
句意：——如果老师不帮助我们，恐怕我们解不出这道数学题。——那是真的。它太难了。
考查连词辨析。if如果；是否；unless除非，如果不；because因为；as soon as一……就。根据句意“It’s too difficult”可知，这个数学题很难，因此这里表示“如果没有老师帮助，就不会……”，应用unless引导条件状语从句。故选B。
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