If parents never expect their children to be helpful at home

If parents never expect their children to be helpful at home,they are sure_.
If parents never expect their
children to be helpful at
home,they are sure___.
A.not B.not to
C.not to be D.not to be that
为什么选C不选B?

著名诗人 1年前已收到3个回答举报

蝴蝶无梦幼苗

共回答了19个问题采纳率：89.5% 举报

If parents never expect their children to be helpful at home,they are sure___.
如果父母不指望孩子们在家勤快些,他们就必定不会（在家勤快）
这里其实是 not to be (helpful at home) 须与前面对应.

1年前

laopanpan 幼苗

共回答了264个问题举报

选B局子里就没有动词了，用be动词顶替

1年前

joy_wan2001 幼苗

共回答了1个问题举报

和be helpful 对应的

1年前

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你能帮帮他们吗

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