请教none of X后面的谓语应该是单数还是复数. 以下是从大全阅读里找出来的.

Since 1953, many experimental attempts to synthesize the chemical constituents of life under “primitive Earth conditions” have been performed, but none of these experiments has produced anything approaching the complexity of the simplest organism.

(这里用单数)

None of these translations to screen and stage, however, dramatize the anarchy at the conclusion of A Connecticut Yankee, which ends with the violent overthrow of Morgan’s three-year-old progressive order and his return to the nineteenth century, where he apparently commits suicide after being labeled a lunatic for his incoherent babblings about drawbridges and battlements.

(这里用复数)

为什么?

Longman Dictionary of Contemporary English:

when None of is followed by a plural noun, it usually takes a plural verb in ordinary speech.

None of us are ready yet.

But in formal writing a singular verb is used.

None of our factories is in operation yet.