问题补充：
—What did he say just now? —He wondered.
A. when he can join us
B. that he could join us
C. when could he join us
D. whether he could join us or not
答案：
A. when he can join us
B. that he could join us
C. when could he join us
(答案→)D. whether he could join us or not
解析：
试题分析: 句意：他刚才说什么？他想知道是否他能加入我们。宾语从句语序为陈述句语序，主句为过去时态时，从句也为相应的过去时态，wondered想知道，从句为一般疑问句，故选D
