They had just finished the work there was another one waiting for them.A. whileB. whenC.

问题补充：

They had just finished the work there was another one waiting for them.

A. while

B. when

C. as

D. since

答案：

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。