2. 外语
  3. It is not uncommon for there______ problems of communication between the old and the young.

It is not uncommon for there______ problems of communication between the old and the young.

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问题 It is not uncommon for there______ problems of communication between the old and the young.
选项 A、being
B、would be
C、be
D、to be
答案C
解析 essential表示“必须的”，其后所接从句中谓语用“should+动词原形”表示虚拟，其中should可省略。故C为答案。
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