单选题
Having finished their morning work, the clerks stood up behind their desks, ______ themselves.
A、
expanding
B、
stretching
C、
prolonging
D、
extending
【正确答案】
B
【答案解析】
stretch oneself伸懒腰，伸展身体；expand伸开，展开；prolong延长(时间)；extend伸长。句意：做完了上午的工作；职员们从桌子后面站起来，伸展伸展身体。
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