问题
选择题
The little girl was jumping __________ in the kindergarten, waiting for her mother.
A．upside down
B．back and forth
C．back to forth
D．up and down
答案
答案：D
考查词组辨析：A. upside down颠倒，B. back and forth来回D. up and down上下，句意是：小女孩在幼儿园上上下下的跳，等着她的妈妈。选D。