高中英语单选问题!求解!For English teachers______a more effective role in teaching,they must make every effort to raise students'cross-cultural awareness.A.to playB.playingC.having playedD. play我选的是B 可是标准答案是A 为什

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高中英语单选问题!求解!For English teachers______a more effective role in teaching,they must make every effort to raise students'cross-cultural awareness.A.to playB.playingC.having playedD. play我选的是B 可是标准答案是A 为什
高中英语单选问题!求解!
For English teachers______a more effective role in teaching,they must make every effort to raise students'cross-cultural awareness.
A.to play
B.playing
C.having played
D. play
我选的是B 可是标准答案是A 为什么啊?帮我解释下!

高中英语单选问题!求解!For English teachers______a more effective role in teaching,they must make every effort to raise students'cross-cultural awareness.A.to playB.playingC.having playedD. play我选的是B 可是标准答案是A 为什
根据上下文,而且句首有一个for就是对英语老师来说,后面要接不定式表示目的,对应于老师来说,为了在教学中扮演更有效的角色,他们必须……

to do 一般表示目的
ing一般表示动作的同时进行

to +动词原形,表示目的

to 有表示“为了”的意思,也就是表示目的

因为前面有一个For,所以后面要跟To....