Condenses choline with CDP-diglyceride to produce phosphatidylcholine and CMP. a CDP-1,2-diacyl-sn-glycerol + choline = a 1,2-diacyl-sn-glycero-3-phosphocholine + CMP + H(+) Activated by CDP-diacylglycerol especially in the presence of Triton X-100 (0.1% w/v) at concentrations where micelles are formed. Maximal activation by Triton X-100 at 0.2% w/v, but higher concentrations become inhibitory. Inhibited by EDTA and high concentrations of choline. Optimum pH is 8.0 in cell-free extracts. Activity decreases as pH is raised or lowered. Belongs to the CDP-alcohol phosphatidyltransferase class-I family.