题目

He           if you           him． A．will come; will invite             B．will come; invite          C．comes; will invite 答案：B14．已知正项数列{an}的前n项和为Sn，当n≥2时，（an-Sn-1）2=SnSn-1，且a1=1，设b${\;}_{n}=lo{g}_{2}\frac{{a}_{n+1}}{6}$，则b1+b2+…+b10等于（　　）A．64B．72C．80D．90