表示时间,距离,重量和金钱等作主语时谓语动词用单数,故是is ,而不是are
第二空：序数词前用a ,表示‘ 又一,再一’ .翻译：我们要多一周（ 意思是前面用了两周,还要多一周）
two weeks (is not) enough for us to finish this task.we need( a third )week.
two weeks (is not) enough for us to finish this task.we need( a third )week.
为什么第一个空是is 不是 are .
为什么第一个空是is 不是 are .
英语人气：488 ℃时间：2019-10-20 20:20:44
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