原题为：
the game which the young man ______ were difficult to play.
A. take part in
B. attend
C. join
D. join in
我认为原题有多处错误：
(1) the 在句首，应该大写。
(2) 主句的主语 the game 和谓语 were 的数不一致。
(3) 定语从句的主语 the young man 与谓语动词 join in 的数不一致。
(4) 选项的时态与题干部分的时态不一致（应同为一般现在时或一般过去时）。
此题若作以下改动，D 才是对的：
The games which the young man______ were difficult to play.
A. take part in
B. attend
C. join
D. joined in