题目
Before you ask someone for help, find out _________ he is the right person for your problem.
A．since B．that C．whether D．unless
A．since B．that C．whether D．unless
A.
since
B.
that
C.
whether
D.
unless
知识点：专题08 单项选择专练100题（二）（人教版）章节：专题08 单项选择专练100题（二）（人教版）