问题补充:
---There is no doubt he will come tomorrow.
---But I doubt he will come here on time.
A. that; that
B. if; that
C. whether; that
D. that; if
答案:
A. that; that
B. if; that
C. whether; that
(答案→)D. that; if
解析:句意:毫无疑问他明天回来。但是我怀疑他是否会按时到这。There is no doubt that. ........是毫无疑问的。if/whether 是否。