They had just finished the work there was another one waiting for them.
A. while
B. when
C. as
D. since
网友回答
A. while
(答案→)B. when
C. as
D. since
解析：考查连词辨析。A当…时；然而；尽管；B当…时；在那时。尽管；C因为；D既然；句意：他们刚刚完成那项工作，在那时有另外一份工作在等着他们了。本句中的when是一个并列连词，后面的句子往往表示的是意料之外的结果。故B正确。