He seems too tired today, and I wonder he got a good sleep last night.
A. when
B. that
C. if
D. where
网友回答
A. when
B. that
(答案→)C. if
D. where
解析：主要测试宾语从句。有语境可知句子I wonder中的动词wonder需要宾语，同时结合所给答案可知选择if最佳。译文：今天他看起来比较疲惫，我想知道他昨晚是否睡了个好觉。例如：I rang them to see if I could cancel the appointment。我给他们打电话看能否取消约会。