The airline stewardess (空姐) said to passengers on ______ with a beautiful smile, “welcome _________!”
A．a(chǎn)board; board B．board; aboardC．board; board D．a(chǎn)board; aboard
B
詞義辨析。固定詞組On board在船,火車,飛機上(的)；aboard登船，登飛機；句意：航空公司的空姐微笑著對飛機上的乘客說：歡迎登記。
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