单选题 Please keep a(n) ______ on my suitcase while I go to buy my ticket.
【正确答案】 C
【答案解析】[解析] to keep an/one’s eye on sb./sth.:(口语)照看、留神,密切注意等。如:
Keep your eye on the baby.要留心照顾婴儿。
其他三项不能与动词keep构成固定结构,故C)项为答案