题目

下列常见分子的中心原子的杂化轨道类型是SP3的是A、NH4+  B、BF3     C、苯（C6H6）      D、CO2  答案：A解析:  We saw several natives advancing towards our party, and one of them came up to us, ________ we gave some bells and glasses． [　　] A．to which B．to whom C．with whom D．with which