could I borrow your dictionary?[ ]

题目

could I borrow your dictionary?[ ]
A;yes,you may borrow
B;yes,your could
C;yes,help yourself
D;yes,go on
必须有理由

答案

C.因为如果是A,MAY的回答问句中应为May I borrow your dictionary?B答案中有明显语法错误．而D答案解释为继续的意思．只有C答案意为”自己拿吧”的意思．