A、  B、  C、  C(A)该句子不适合回答when疑问句，而适合回答否定疑问句。(B)利用与construction相关的protective helmet引起混乱。(C)该选项具体回答了日程，所以正确。

Haven’t you tried this new software?
(A)Yes, it was very delicious.
(B)I haven’t had a chance yet.
(C)Can I try these shoes on?

When is this construction work going to be all done?
(A)That’s what I was thinking.
(B)With a protective helmet.
(C)Not until August.