问题补充：
.I the English conversation yesterday evening.
A. joined
B. join in
C. took part in
D. joined into
答案：
A. joined
B. join in
(答案→)C. took part in
D. joined into
解析：take part in 和join in都可以表示参加集体活动，join用作及物动词时，指参加某个组织或陪伴另一些人（参加活动）。
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