(A):"a series of" (一系列的)前面的謂語動詞是用單數(shù);
"There is a series of accidents." 正確.["a" 的前面是不可能用"are"的!]
注:
"a series of", "a set of"一套, "a portion of", "a chain of" ...要用單數(shù)形式 "is/was/has been...".
(B):"a series of" 后可加復(fù)數(shù)名詞,不可數(shù)名詞.