题目

Investigators are still trying to determine the __________ of the accident. A.cause          B.problem             C.reason         D.puzzle 答案：A 解析: cause起因；problem问题；reason理由；puzzle迷。这里指事故的起因。桪id you take a lot of photos during your visit to Shanghai?　　 梇es. And I'll show them to you as soon as they ________. A. try out B. come out C. work out D. take out