A)He needs it back tomorrow.
B)He doesn't want to lend it.
C)He doesn't think the bicycle is good.
D)He wants to make some promises.
原文：
W: Can I borrow your bicycle?
M: Only if you promise to return it tomorrow.
Q: What does the man say about the bicycle?
M的回答是省略句，把省略的地方填补出来便是：You can borrow my bicycle only if you promise to return it tomorrow.即他需要W的承诺。