缩孔与缩松
参考答案：
在铸锭中部、头部、晶界及枝晶等地方，常常有一些宏观和微观的收缩孔洞，通称为缩孔，细小而分散的缩孔称为缩松。
________ clearly ________ nothing to do, the soldiers left the village the next day.
A．It; was
B．It; being
C．There; was
D．There; being
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