--- Shall I give you a hand as your case is so heavy?----Thank you..A. Of course you canB.

问题补充：

--- Shall I give you a hand as your case is so heavy?

----Thank you..

A. Of course you can

B. It’s up to you.

C. If you can

D. It couldn’t be better.

答案：

(答案→)A. Of course you can

B. It’s up to you.

C. If you can

D. It couldn’t be better.

解析：考查交际用语;A. Of course you can当然可以，B. It’s up to you.由你决定， C. If you can如果你能的话D. It couldn’t be better.再好不过了，问句是：你的箱子很重要我帮忙吗？

A项符合句意。