3．Jack，along with his classmates，was working （work） on the project when the teacher came in．

分析 當(dāng)老師進(jìn)來時(shí)，杰克和他的同學(xué)正在做這個(gè)項(xiàng)目．

解答 答案：was working
根據(jù)句式，along with 聯(lián)接兩個(gè)并列主語時(shí)，謂語根據(jù)前面的主語來判斷，即Jack是句子主語，謂語用單數(shù)．再結(jié)合句意，當(dāng)老師進(jìn)來時(shí)，他們正在做．故用過去進(jìn)行時(shí)．

點(diǎn)評(píng) 考察在具體語境中使用進(jìn)行時(shí)態(tài)．

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