My mother is out.I___look after my little brother.

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My mother is out.I___look after my little brother.
A.have to B.can C.need D.A and C

A
have to 不得不,必须
如果用 need ,应该是 need to
再问：为什么need就不可以呢？单独也可以作为情态动词啊！
再答： need 作情态动词常用于否定句或者疑问句。本句是肯定句，所以不能作为情态动词使用。 C 是错误的，只能选 A.
再问：你确定吗？马上要中考了！一定要靠得住啊！
再答：放心吧，语法书上写着呢！ need 作为情态动词用于否定句或疑问句。本题命题相当有水平，记住need 作为情态动词和实意动词的区别。

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