11．However frequently he         in doing the experiment，he never loses his confidence．（　�。�
A．defeatB．gets defeatedC．was defeatedD．will defeat

分析 盡管他在實(shí)驗(yàn)中頻繁地失敗，但是他從沒有喪失信心．

解答 答案 選B  be defeated 被打敗 與get defeated的意思相同．從句中有頻度副詞 frequently 頻繁地，屢次地；主句使用的又是一般現(xiàn)在時，表明現(xiàn)在的情況．故選B

點(diǎn)評 副詞always，constantly，continuously，frequently，generally，normally，occasionally（偶爾）等常用于一般現(xiàn)在時態(tài)中．

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