What he does is
______ computer games. (可多选)
A. play B. to play C. plays D. playing
此题可选 A、B、C:
What he does is play computer games.
What he does is to play computer games.
What he does is plays computer games.
如果 does 变成 did、(is) doing、(has/have) done,则其后作表语的动词也可以使用相同的形式:
What she does is (to) play / plays computer games.
What she is doing is (to) play / playing computer games.
What she has done is (to) play / played computer games.
What she did was (to) play / played computer games.
参考资料1——摘自Swan的《牛津英语用法指南》:
参考资料2——摘自章振邦高级英语语法: