All the teachers discussed the plan that they would like to see in the next school year.

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A. carry out
(答案→)B. carried out
C. to carry out
D. be carrying out
解析：考查非谓语动词。这个句子是个复合句。其中“that they would like to see carried out in the next year”是定语从句，属于“the plan”的定语。如果把定语从句转换为一个完整的句子，那就是：“They would like to see the plan carried out in the next year.”(see + sth. + done,看到某事物被...)the plan在定语从句中属于被动，所以填carried out.。