问题补充：
Jenny is on holiday now. I wonder.
A. when she will come back
B. when she came back
C. when will she come back
D. when did she come back
答案：
(答案→)A. when she will come back
B. when she came back
C. when will she come back
D. when did she come back
解析：考查宾语从句。宾语从句用陈述句的语序，排除C和D，句意为“珍妮现在在度假。我想知道她什么时候回来，”可知到现在没有回来，从句用一般将来时表示。故选A。
