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Shehelpedhimoneofhisoldbookcasesupthestairs.a.carryingb.tocarryingc.forcarryingd.carry为什么A不可以啊?

题目详情
She helped him ____one of his old bookcases up the stairs.
a.carrying
b.to carrying
c.for carrying
d.carry
为什么A不可以啊?
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答案和解析
help这个词后面跟动词一般是 to do ,to 可以省略,习惯用法.选D