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问题: A series of lectures_____next week.

A series of lectures_____next week.
A. are being held
B. is holding
C. is being held
D. will hold

解答:

选C. is being held. A series of lectures一系列的讲座/ 这是一个整体,应该用单数的被动形式.

eg;There was a series of bangs as the box fell down the stairs.
箱子掉下楼梯时发出一连串响声。
(虽然 bangs是复数,但是 a series of bangs 要当单数看)