A、  B、  C、  C问句是问对方“能不能帮忙，有没有其他安排?”回答I’m free“我有空”，也就是有空可以帮忙，最为恰当。(A)问句中有or时，不能用Yes／No回答。而且，不能因为问句中有assist“帮忙”，就选

(Man) Who’s in charge of making the director’s travel arrangements?
(Woman) (A) That’s handled by his secretary.
(B) Use the corporate credit card to pay.
(C) The travel department called about the charges.

(Man) Can you assist Mr. Jackson with this project, or do you have to go to the meeting?
(Woman) (A) Yes, it was very helpful.
(B) I met him at the party.
(C) I’m free all afternoon.