问题
单项选择题
Mr. Scott asked for an assistant because his work load was too ______.
A．preoccupied
B．onerous
C．trifling
D．omnipresent
答案
参考答案：B
解析： preoccupied被先占的，全神贯注的；onerous繁重的，费力的；trifling不重要；omnipresent普遍的，无所不在的。