解析：該題答案為A.They each不等于each of…，each of這個詞組作主語謂語用單數(shù)如each of the students hands in their homework，而they each作主語，謂語要隨each前面的詞來變化。
167.Not only ____ this machine but ____ it.A.can he run……can he repair B.can he run……h(huán)e can repair
C.he can run……h(huán)e can repair D.he can run……can he repair
解析：該題答案為B，在not only……but（also）句型中，只有but前面的部分倒裝，but后面仍是正常語序。
168.____ that he went to sleep.A It was until midnight B That was until midnight
C It was not until midnight D That was not until midnight解析：該題答案為C.強調(diào)until結(jié)構(gòu)時，要將否定詞not移到until前。又如：He didn‘t leave until twelve改為It was not until twelve that he left.
169.There are a lot of students ____ in the class room.A talk B talking C talked D to talk
解析：該題正確答案為B.There be句型為倒裝句，可換為A lot of students are talking in the class room.又如：There is a lot of noise heard out in the street.
170.While ____my homework，I heard a cry for help.A do B did C doing D having done
解析：該題答案為C.該空處省略了I‘m，相當(dāng)于while I’m doing my home work.如：While playing guitar，he is singing.
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