高二英語
1 C
LACK在這裏是動詞。lack== are in need of -- -, want - - --
2 A
PUT INTO USE在這裏是被動語態結構，過去分詞做時間狀語使用。
PUT into use in April 2010 == WHEN the hotline was put into use - - - - .
3 B
LACKING在這裏是現在分詞表達“轉折”。though l;acking變成句子就是：
though they lacked money.