Where to find the teacher and where to do the experiment ______.
A: are not known
B: is not known
C: has not known
D: have not known
A: are not known
B: is not known
C: has not known
D: have not known
举一反三
- If only I where he lives. A: knew B: have known C: know D: had known
- I have known her for a long time. / She........................ to me for a long time. A: has known B: has been known C: is known
- Little ______ when I took the trip where it would lead me. A: have I known B: had I known C: do I know D: did I know
- Where Janet will go / is not known yet.
- It is known to us ___ where there is pollution, there is harm.