Children will work actively if _______. ?
A．praiseB．praisedC．praisingD．to praise
B
錯(cuò)因分析：有些考生會(huì)認(rèn)為if后要用動(dòng)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(shí)，這是條件狀語(yǔ)從句的省略形式，根據(jù)主語(yǔ)與動(dòng)詞的關(guān)系可知，孩子們受到表?yè)P(yáng)，于是正確答案選B。拓展：在時(shí)間、條件、讓步、比較等狀語(yǔ)從句中，當(dāng)從句的主語(yǔ)與主句的主語(yǔ)一致，且謂語(yǔ)部分含有be動(dòng)詞時(shí)，則可將從句的主語(yǔ)與be動(dòng)詞同時(shí)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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