They required the crops ______ harvested at once.
A. should be B. be C. are D. must be
赞同曹老师解答观点。在中国国内应试英语考试中,A和B答案都是正确的。
【1】They required (that省略)the crops be harvested at once.【美式英语】
【2】They required (that省略)the crops should be harvested at once.【英式英语】
以上2个英语句子都是正确的。