He is writing a letter______ a pen that I have never seen before.

A. by B. with C. for D. at

 

B

【解析】

試題分析：考查介詞辨析。句意：他正在用一支我從未見過的鋼筆寫一封信。by通過，后跟名詞或動(dòng)名詞；with可以表示用某種工具；for表示目的或一段時(shí)間；at指整點(diǎn)時(shí)間或指小地點(diǎn)，with a pen用一支鋼筆，故選B。

考點(diǎn)：考查介詞辨析

 

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