【单选题】内部计算函数Sum的意思是求所在字段内所有值的______。
【单选题】What do we learn about the man’s experience?
A.
Hewas caught in a storm.
B.
Hevisited storm—hit—islands.
C.
Hemade a voyage two weeks ago.
【单选题】I can hardly remember any occasions _______ I get caught in a traffic jam in our town.