一，单选。
1．---- How do you study ______ a test?
---- I study ______ working with a group.
A: for by B: by in C: for from
2．Have you ever ______ with a group?
A: study B: studying C: studied
3．My sister said she studied by ________ English-language videos.
A: watch B: watching C: watched
4．What about _______ the textbook?
A: reading B: read C: to read
