He has letters to deal with. He has to work from morning to night.A. many ofB. a great de

问题补充：

He has letters to deal with. He has to work from morning to night.

A. many of

B. a great deal of

C. masses of

D. the number of

答案：

A. many of

B. a great deal of

(答案→)C. masses of

D. the number of

解析：考查近义词组：句意：他有大量的信要处理，他得从早到晚工作。A项多了of，B. a great deal of修饰不可数名词，C. masses of大量的，可数不可数都可以修饰，D. the number of…的数量，意思不符合，选C。