问题
______ without friends ______ the most difficultchallenge for Chuck while living on the island.
A:Wanting the job very much
B:Although wanting the job badly
C:Though he wanted the jobvery much
D:How tosurvive, are
B:Although wanting the job badly
C:Though he wanted the jobvery much
D:How tosurvive, are
正确答案是：
