___ you did it is not known to all.
A: Who
B: What
C: How
D: Which
A: Who
B: What
C: How
D: Which
举一反三
- We don't know ___ you did it. A: who B: what C: how D: which
- We don't know ______ they did it . A: how B: who C: what D: which
- The fact______exercise is good for health is known to all． A: which B: what C: that D: it
- Do you know ____ to start the machine? A: how B: what C: who D: which
- 5W1H分别是？（） A: what、where、when、who、which、how B: what、where、when、why、which、how C: why、where、when、who、which、how D: what、why、when、who、which、how