问题补充：
—How about shopping with us tomorrow?
—I’d love to, I have to prepare for the coming exam.
A. go; and
B. go; but
C. going; but
D. going; and
答案：
A. go; and
B. go; but
(答案→)C. going; but
D. going; and
解析：句意：--- 明天和我们去购物怎么样？---我愿意去。但是我不得不准备即将到来的考试。How about后要跟doing。第二句根据句子意思表示转折用but.
