问题补充：
Why don’t you us to the speech contest?
A. join, join
B. take part in, take part in
C. take part in, join
D. join, take part in
答案：
A. join, join
B. take part in, take part in
C. take part in, join
(答案→)D. join, take part in
解析：考查近义词辨析。join指参加活动时，后加介词in；join后可直接+人或组织；take part in指参加大型活动，并在活动中其积极作用。句意“为什么不加入我们一起参加演讲比赛呢？”后加人作宾语用join；排除B、C；join不能直接加活动，排除A。故选D。
