【题目】Among the biggest problems facing those remote mountainous primary school the lack of experienced teachers.
A. is B. is there
C. are D. are there
在线课程【答案】A
【解析】考查主谓一致。句意：这些偏远山区小学面临的最大问题之一是缺乏有经验的教师。此句是介词短语放在句首，是倒装句。主语是the lack of experienced teachers.是单数，指缺乏有经验教师这种现象，故选A.