David has a big bag in his hand,(保持句意不变） David__ __ a big bag.
问题描述：
David has a big bag in his hand,(保持句意不变） David__ __ a big bag.
答
David is holding a big bag.
David is grabbing a big bag.
carrying就不推荐用了,意思有点变,carrying不一定是拿在手上的.hope it helps:)