【题目】He is so clever that he can solve ______ problems by himself.
A. a great many of B. a large amount of
C. a series of D. much
在线课程【答案】C
【解析】
考查数词。句意：他很聪明，能自己解决一系列问题。A. a great many后直接加可数名词复数，不需要介词of；B. a large amount of +不可数名词；C. a series of+可数名词复数；D. much + 不可数名词。故选C。