变电设备在线监测装置的选用应综合考虑设备的运行状况、（）、资产价值等因素，并通过经济技术比较，选用成熟可靠、具有良好运行业绩的产品。

—Your spoken English is better now.

—Thank you. My teacher always asks us________ English as _______ as possible.   [ ]

A. to speak; many  

B. not to speak; much  

C. to speak; much  

D. not to speak; more