It is not uncommon for there     problems of communication between the old and the young.
A．beingB．would beC．beD．to be
D
考查句型：It is +adj for sb to do sth，it是形式主語，不定式是真正的主語，邏輯主語是there，動(dòng)詞用be，句意：在老人和年輕人之間有交流問題，很正常。選D。
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