-----he ---it?a does;need know b does;need to know c needs ;know d need; to know

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-----he ---it?a does;need know b does;need to know c needs ;know d need; to know

-----he ---it?a does;need know b does;need to know c needs ;know d need; to know
-----he ---it?a does;need know b does;need to know c needs ;know d need; to know

-----he ---it?a does;need know b does;need to know c needs ;know d need; to know
B正确,这里Need 是实义动词