1.In the recent coal mine accident,only 24 miners were rescued and 29 were left _C_ underground.
A.to be trapped B.being trapped C.trapped D.trapping
*leave的用法?是不是相当于be?
答：leave sth. done 在这里的用法相当于make sth. done ,让某事被做.只不过后者是要付出努力的‘让’,前者不需要付出努力的‘让’,只要离开,不用管,就可以了.比如leave the homework unfinished . The accident left 29 peoeple trapped underground. 事故是过去了,人还困在地下!上面的只是被动语态的说法：... and 29 were left trapped underground
译：在最近的一次煤矿事故中,只有24人获救,29人给困在地下.
2.When he struggled up,he felt his left ankle （sprained ）,and found his left hand （swollen ）and his nose （bleeding）.
*这里done和doing要怎么区别使用啊?
答：和上句中的leave, make一样,feel 动词后常跟复合宾语,宾语补足语可以是过去分词或现在分词或形容词.看它与前面宾语在逻辑上的关系而定,主动用现在分词 feel sb. doing sth. ,被动用过去分词 feel sth. done
ankle是被扭(被动的,用过去分词sprained0, nose 是在出血（主动的,用bleeding）hand is swollen (swollen这里是形容词）
3.__C____ confidence in yourself is the biggest barrier _____ greater progress in your work.
A.Lacking of,to making
B.Lack of,to make
C.Lack of,to making
D.The lack of,to make
*我选了D.请解释一下 还有,顺便问一下什么叫介词 to
答：to有不定式符号to和介词to之分,前者后跟动词原形,如to make, 后跟名词或相当于名词的动名词.这时的to解释为“对.”,“到.”,常见的容易误以为是不定式符号的几个：look forward to ..., be used to ., stick to .要记住.
be a barrier to (doing )sth. 意为“对（做）某事来说是一个障碍.这个to就是介词,容易误以为是不定式.Lack可作及物动词,可作名词.如果A没有 of, 则Lacking confidence 作为动名词短语也是可以作主语的.BD的主要错误在于后一空.