A. ask B. asks C. was asked D. were asked

　　谓语动词与as well as前面的名词一致。

　　答案 C

　　16. The hostess together with the guests of honor ________ comfortably in the living room。

　　A. was seated B. seated C. were seated D. were seating

　　谓语与 together with 前的名词一致

　　be seated 就坐

　　Please be seated ladies and gentlmen。

　　Seat the boy next to his brother。

　　答案 A

　　17. The father， rather than the brothers， _______ responsible for the accident。

　　A. is B. are C. have been D. has

　　主语 the father ，单数

　　be responsible for 对……负责

　　答案 A

　　18. Either Carol or Grace ______ to the concert， but one of them has to stay home。

　　A. is coming B. are coming C. will coming D. have come

　　either……or 谓语动词与临近主语一致。

　　答案 A

　　19. The total amount of money ______ 100 dollars。

　　A. is B. are C. has D. have

　　money 不可数名词，谓语动词单数。

　　答案 A

　　20. Great quantities of fish _____ on high seas。

　　A. is caught B。