We don't know how long the building work will last, but we'll be staying with friends for the .
A: duration
B: solution
A: duration
B: solution
举一反三
- I don’t know if he _______ tomorrow. If he _______, we’ll climb the mountain.
- I don't know ______ we can finish the work on time. A: that B: if C: when
- We don’t know whether he’ll come _______ the operation. A: by B: through C: for D: with
- 3. —Friends, we’ll graduate from middle school. We shouldn’t forget the days _______ we spent with classmates. —Yeah, without friends, one can’t be happy. A: when B: how C: who D: which
- We don't know ______ they did it . A: how B: who C: what D: which