To finish the task on time I think we should and cooperate.A. join togetherB. connectC.

问题补充：

To finish the task on time, I think we should and cooperate.

A. join together

B. connect

C. join hand

D. join forces

答案：

A. join together

B. connect

C. join hand

(答案→)D. join forces

解析：句意：为了按时完成这项任务,我认为我们应该联合力量合作。join forces联合力量，A. join together将…拼[连]在一起，B. connect连接，C.项应该是 join hands，选D。