1.I don't know where the key is,but I suppose I A_it at

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1.I don't know where the key is,but I suppose I __A___it at home.
A.could have left
B.should have left
C.must leave
A 的,但我觉得是选 C .
2.A.I didn’t have time for lunch today.
B.I didn’t____C______.
A.neither B.too C.either
为什么选 C ,不是选 B 我觉得是B呢!

1.前面用了“suppose"是一种猜想、假设,“could ”表示一种可能性,与suppose 的猜测对应,coul have left it at home表示“可能把钥匙放在家里了”.
如果选择must leave,"must"表示肯定语气,表示钥匙一定是放在家里了,与前面的suppose的假设就相矛盾了.
2.否定句回答“也”时,只能用either.too用在肯定句.至于neither,一般与nor搭配用,而且是用在句首.
这样解释你明白吗?

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