Tigers are endangered animals.There aren't many of them____
A.leave B .to leave C.left D.to be left
答：C.
譯：老虎是瀕危動物.現(xiàn)在剩下的不多了.
分析：此題考非謂語動詞作定語的用法.
there be 句型的主語（名詞或代詞）在be后,其后置定語可以是分詞或不定式.分詞有兩種句式.
1.there is sb.doing sth.如：
There is a man waiting for you at the school gate.
校門口有一個人在等你.=There is a man who is waiting for you at the school gate.
現(xiàn)在分詞的邏輯主語是man,他與wait是主動并進行的關(guān)系.
2.there is sth.left.如：
There is only 5 minutes left.
只剩下5分鐘了=There is only 5 minutes which is left.
過去分詞left的邏輯主語是5 minutes,它與leave 是被動（被剩下,被留下）的關(guān)系.
there be句型中,也有用不定式作定語的：
There is sth.to do/ to be done.有一些事要做（要被做）.不定式的動詞應(yīng)為及物動詞,它與sth.有動賓的關(guān)系.表示“未來”.
本題中從形式上CD都可以,但不合句意,不合邏輯.（沒有多少老虎要留（被留）下）,說不通.