--What is our physics teacher like, do you know?
--Oh, he is very kind _________ he looks very serious.
| A．because | B．though |
| C．if | D．when |
--What is our physics teacher like, do you know?
--Oh, he is very kind _________ he looks very serious.
| A．because | B．though |
| C．if | D．when |
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