请问这两道机井该选什么啊

请问这两道机井该选什么啊，谢谢~~

The computer company’s present troubles are a result of technological stagnation, marketing missteps, and managerial blunders so that several attempts to revise corporate strategies have failed to correct it.
A.      so that several attempts to revise corporate strategies have failed to correct it.
B.      so that several attempts at revising corporate strategies have failed to correct
C.      in that several attempts at revising corporate strategies have failed to correct them
D.      that several attempts to revise corporate strategies have failed to correct 
E.      that several attempts at revising corporate strategies have failed to correct them

Researchers agreed that the study of new treatments for heart attack patients was extremely important but more research was needed to determine that balloon angioplasty preceded with ultrasound was or was not any better for heart attack patients than the balloon procedure by itself.

A more research was needed to determine that balloon angioplasty preceded with ultrasound was or was not any better for heart attack patients than

B more research was needed for determining whether or not balloon angioplasty preceded by ultrasound is any better for heart attack patients than is

C that more research was needed to determine whether balloon angioplasty preceded by ultrasound is any better for heart attack patients than

D that more research was needed to determine that balloon angioplasty preceded with ultrasound was any better for heart attack patients than

E that more research was needed for determining that balloon angioplasty preceded by ultrasound is or is not any better for heart attack patients than is

D,C