15.我懷疑那個活動是否值得參加.
I doubt whether the activity is worth taking part in.

分析 這是一個主從復(fù)合句,主句"我懷疑",連接詞"是否",從句"那個活動值得參加",其中"值得做"對應(yīng)短語"be worth doing"

解答 根據(jù)分析,答案為:I doubt whether the activity is worth taking part in.

點評 本題考查doubt的用法.在否定句和疑問句中,doubt后面接that引導(dǎo)的賓語從句.在肯定句中,doubt后面一般接whether或if引導(dǎo)的賓語從句.

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