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Bobpromisestojoininthefootballmatch______hehastohelphisparentsonthefarm.A.ifB.asC.unlessD.when
题目
Bobpromisestojoininthefootballmatch______hehastohelphisparentsonthefarm.
A.if
B.as
C.unless
D.when
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参考答案和解析
正确答案：C