题文
He smiled politely ________ Mary apologized for her drunken friends. (2012·山东，27)
| A．as | B．if |
| C．unless | D．though |
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He smiled politely ________ Mary apologized for her drunken friends. (2012·山东，27)
| A．as | B．if |
| C．unless | D．though |
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