[수다] 여기 영문법 장인 있나

When the new educational app launched, early downloads were three times

(① more higher than) the small company had predicted.

A number of teachers recommended it to their students,

but the number of active users stayed lower than 

(② the marketing team expected), which puzzled them.

One developer suggested (③ that the tutorial be updated)

so that everyone (④ understand) the goals clearly,

yet his explanation wandered through so many side points that no one followed the whole idea. 

여기서 1번이 확실히 오답인건 알겠는데

4번도 틀린거 같지 않음?