问题补充：
There was terrible earthquake in in Japan! It killed people.
A. /, thousands of
B. /, thousand
C. a, thousands of
D. a, thousands
答案：
A. /, thousands of
B. /, thousand
(答案→)C. a, thousands of
D. a, thousands
解析：句意：，日本发生了可怕的地震。地震中死了成千上万的人。a terrible earthquake一场可怕的地震用不定冠词a ,表不确定所指时用thousands of，故选C
