植物、气候、地理和地壳运动都是成煤的必要条件，同时具备上述条件的时间越长，越有利成煤。()

一条断层上盘下降，其走向又垂直地层的走向，这条断层既是正断层又是横断层。() 点击查看答案&解析

I am very familiar with him, so I recognized his voice ___________.

A、particularly
B、especially
C、immediately

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