问题补充：
don’t think you can work out the maths problem＿＿＿＿her help.
A. since
B. unless
C. with
D. without
答案：
A. since
B. unless
C. with
(答案→)D. without
解析：“在……帮助下”用with,“没有……帮助”用without。
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