He seems too tired today, and I wonder he got a good sleep last night. A．when B．
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He seems too tired today, and I wonder he got a good sleep last night.
A．when B．that C．if D．where
试题答案
C
解析:
他今天看起来很累，我怀疑他昨晚是否睡好了。if引导宾语从句。故选C。