We don't know ______ they did it .
A: how
B: who
C: what
D: which
A: how
B: who
C: what
D: which
举一反三
- We don't know ___ you did it. A: who B: what C: how D: which
- I don’t know ____ he does. A: who B: what C: which
- I don’t know ____________ to make bread. A: how B: that C: which D: what
- I don't know _________ to deal with such matter. A: what B: how C: which D: /
- —Who is he Is he our new teacher —I’m sorry. I don’t know ______ and ______ he is. A: who; what B: who; how C: how; what D: where; how