问题补充：
—— What do you think made the girl so glad?
—— ＿＿＿＿＿ a beautiful necklace.
A. As she received
B. Receiving
C. Received
D. Because of receiving
答案：
A. As she received
(答案→)B. Receiving
C. Received
D. Because of receiving
解析：Receiving a beautiful necklace(makes the girl so glad).
