Children will work actively if _______. ?
A．praiseB．praisedC．praisingD．to praise
B
錯因分析：有些考生會認為if后要用動詞-ing形式，或用不定式表示還未發(fā)生的行為，于是誤選C或D。其實，這是條件狀語從句的省略形式，根據(jù)主語與動詞的關(guān)系可知，孩子們受到表揚，于是正確答案選B。拓展：在時間、條件、讓步、比較等狀語從句中，當從句的主語與主句的主語一致，且謂語部分含有be動詞時，則可將從句的主語與be動詞同時省略。如：The old man will be very excited when talking (="he" is talking) about his past experiences.  She will be unhappy if (she is) criticized.
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