—How are you getting on with your English?

—Oh, great. Things are going as well as ________.

A．plans

B．to plan

C．planning

D．planned

叶绿体悬浮液在黑暗中能否由CO2和H2O合成葡萄糖？如果不能，必须加入什么？假设所有还原性磷酸戊糖（RPP）循环中的中间物和激活的酶都存在。