. _without friends ___ the most difficult ch

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. _________without friends ___________ the most difficult challenge for Chuc
_________without friends ___________ the most difficult challenge for Chuck while living on the island. A. How does he survive ... are B. How to survive ... are C. How does he survive ... is D. How to survive ... is

D. 此句主语为_________without friends ,为不定式作主语（前面加了关系副词）,单个非谓语动词作主语,谓语用单数.
A,C；首先排除,主语从句用陈述句

. _________without friends ___________ the most difficult ch the more difficult、 the most difficult、 a most difficult、 a 英语语法 the most difficult In the world The Most Difficult Problems In The World 选择哪一个This is the most difficult That problem is the most difficult ---- all FRIENDS IS THE MOST FUNNY SHOW EVER. The more difficult roads often have the most beautiful scene is,most,difficult,book,in,the,This,exercise,the(.) What is the most difficult part of riding the bike? Rock music usually ___________ the young people in most coun 2.Most of the ___________(Australia) speak English,too.