He seems too tired today, and I wonder _________ he got a good sleep last night.
A．whenB．thatC．ifD．where
C

試題分析：句意：今天他似乎很累，我想知道他昨晚是否睡了一個好覺。A. when 什么時候，B. that連接賓語從句的時候，沒有含義，C. if是否，D. where哪里，所以選C。
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