2、B　 同上 3、B　 见讲解2。 4、C　 见讲解16。

1、A　 因有连词but,所以谓语形式跟Nothing一致,用第三人称单数。见讲解4。

50、My family as well as I　　　　　　　　 glad to see you.　　　 　　A. am　 B. are　 C. is　 D. was

　　　 [答案]:

49、My father, together with some of his old friends,　　　　　　　　 there already.

　　　 　　A. have been 　B. has been　 　C. had been　 　D. will be

48、There are two roads and either　　　　　　　　 to the station.

　　　　 　A. leads　 　B. lead　 C. are leading 　D. is leading

47、Nine plus three　　　　　　　　 twelve.

　　　 　　A. makes　 　B. make　 　C. is making 　D. are making

46、Twenty miles　　　　　　　　 a long way to cover.

　　　 　　A. were　 　B. are　 C. is　 D. seem to be

45、Ten thousand dollars　　　　　　　　 a large sum of money.

　　　 　　A. are　 B. is　 C. were　 　D. seem

44、Very few　　　　　　　　 his address in the town.

　　　 　　A. knows　 　B. know　 　C. are knowing 　D. has known

43、Not only the workers but also the machine　　　　　　　　 not there.

　　　 　　A. are　 B. were　 　C. is　 D. has