问题补充：
He an English club last year and has improved his English a lot.
A. protected
B. produced
C. joined
D. received
答案：
A. protected
B. produced
(答案→)C. joined
D. received
解析：protect保护；produce生产；join参加，加入；receive接收，收到。句意：去年他加入了一个英语俱乐部，这很大程度上提到了他的英语水平。结合语境可知选C。
