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

熱心網友

A D A B

熱心網友

a b a b

熱心網友

1.A.后面有since，所以是完成時,只能選擇A了。2.D.seat是名詞，座位的意思，作為連句，必須有連接詞，或者用現在分詞開頭，只能選擇D了。3.A.習慣用語，could是禮貌用語，其實用can也可以，用could更有禮貌，所以答句中用can來回答。因此選擇A。4.B.keep on是“一直”的意思，其余選項都不符合題意，因此選擇B。

熱心網友

A D A B

熱心網友

A D A B

熱心網友

C B A D