问题补充:
Only by practising constantly greater progress.
A. we can make
B. then we will make
C. can we make
D. we must make
答案:
A. we can make
B. then we will make
(答案→)C. can we make
D. we must make
解析:考察主谓倒装。当only位于句首引导条件从句时,主句部分倒装,从句不倒装,只有选选项C为倒装语序。故选C。