D的话后面没有it 即The problem is (quite too) difficult for us(to work out)
因为这句话的主语是这个问题,to work out the problem 把the problem 放到前面当主语,后面就不应该再有别的了·
The problem is () difficult for us()
3个回答
相关问题
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The problem is ( ) different for us ( ) .
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— The problem is a bit difficult .