I don't know the reason _____ he looks unhappy today.
举一反三
- I don’t know the reason ______ he is late.
- I don’t know the reason he is late. A: that B: which C: weather D: why
- I don’t know the reason ______ he is late. A: that B: why C: which D: how
- I don`t know him but he looks as if he（ ）be her brother. A: can B: would C: could D: shall
- I don't know the reason _______he quarreled with Zhang Lin A: what B: why C: which D: that