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问题: 一道选择

He _____us in the discussion yesterday.
A.joined
B.would join
C.took part in
D.would take part in

解答:

He _____us in the discussion yesterday.
A.joined
B.would join
C.took part in
D.would take part in
选A.joined 加入某人应该join.且用一般过去时.