Jack wasn’t saying anything，but the teacher smiled at him________he had done something very clever. (2011·湖南，33)
| A．as if | B．in case |
| C．while | D．though |
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Jack wasn’t saying anything，but the teacher smiled at him________he had done something very clever. (2011·湖南，33)
| A．as if | B．in case |
| C．while | D．though |
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