用逗号隔开,说明前后关系是主从
A是不定式,主句和从句的主语必须一致,显然a form 不能作为不定式的主语,
C动宾结构,不构成单句,无法和后面的句子构成语法关系
D和A类似,主语和从句主语不一致
只有B是正确的,前一个是IF引导的条件从句,后一个是主句,语法关系正确,语义上也正确
_________,a form must be filled in.
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