一个简单的时态题 我却糊涂了 求教啊

superfanluyao

250.(25489-!-item-!-188;#058&001585)(GWD30-Q29)



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

C是正确的 可我觉得都是过去时态 为什么 C要用is啊

superfanluyao

要沉了 顶起来= =
坐等解答

fengshou

C跟D的区别是 whether...is 和 that...was 的区别

不过在这里说的是一个还要更多research的问题 还是whether...is搭配比较好

superfanluyao

可是时态貌似不对啊 难道是题不好？

fengshou

是搭配的问题 不是时态滴问题。