1.The old lady entered the hospital ,( supported )by her two
1.The old lady entered the hospital ,( supported )by her two sons
A.supported B.being supporting C.being supported D.supporting 为什么选A不选B?
2.After ( what )seemed a long time ,we eventually reached the top of mountain.为什么选what 不选 it it 不是也能引导主语从句么?