1.Mr. White works with a chemical company but he___in his sister's shop since he is on leave.A has worked B works C is working D worked2._________, the film began.A Having been seated B All of us having taken the seatsC Having seatedD After we have sat down3.----Could I use your bike,Jack? ----Of course,you_____________________.A can B may C could D might4. The heavy rain ____ for several days and all the roads were flooded.A held on B kept on C fell down D kept up
热心网友
A D A B
热心网友
a b a b
热心网友
1.A.后面有since，所以是完成时,只能选择A了。2.D.seat是名词，座位的意思，作为连句，必须有连接词，或者用现在分词开头，只能选择D了。3.A.习惯用语，could是礼貌用语，其实用can也可以，用could更有礼貌，所以答句中用can来回答。因此选择A。4.B.keep on是“一直”的意思，其余选项都不符合题意，因此选择B。
热心网友
A D A B
热心网友
A D A B
热心网友
C B A D