. _________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.

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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.
. _________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

. _________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.
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

d

选择D ,How to survive without friends 做主语

. _________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. f： %F. F f f U>2f f SUMIF(F:F, =SUMIF(F:F, F.F是什么法兰 f(a)f(b) FFDFDDGDGFG F FG F GGF F F FF GF F m/m mm/m m/f f/f f/m/f f/f f(x)=sinx,求导f('f(x)),f(f'(x)),[f（f(x)）]' y=f(f(f(x))) 求导 向心力F=T+f?f是? 已知f 6f