itis not common for there _ problems of communication between the old and the young.a,being b to be选b,为什么选A 不对

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itis not common for there _ problems of communication between the old and the young.a,being b to be选b,为什么选A 不对
itis not common for there _ problems of communication between the old and the young.
a,being b to be
选b,为什么选A 不对

itis not common for there _ problems of communication between the old and the young.a,being b to be选b,为什么选A 不对
固定用法 for there to be 和 of there being