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Comparisons were drawn between the development of television in the 20th century and the diffusion of printing in the 15th and 16th centuries. Yet much had happened (21) As was discussed before, it was not (22) the 19th century that the newspaper became the dominant pre-electronic ( 23), following in the wake of the pamphlet and the book and in the (24 ) of the periodical. It was during the same time that the communications revolution (25 ) up, beginning with transport, the railway, and leading (26) through the telegraph, the telephone, radio, and motion pictures (27) the 20th-century world of the motor car and the airplane. Not everyone sees that process in (28) . It is important to do so.

21. [A] between before [C] since [D] later
22. [A] after by [C] during [D] until
23. [A] means method [C] medium [D] measure
24. [A] process company [C] light [D] form
25. [A] gathered speeded [C] worked [D] picked
26. [A] on out [C] over [D] off
27. [A] of for [C] beyond [D] into
28. [A] concept dimension [C] effect [D] perspective

Thank you very much !
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Hi,
I agree.

Clive
Comments  
Hi,

Please post your answers first.

Thanks, Clive
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OK
A D C B B A D D
 Clive's reply was promoted to an answer.
Hi,
I really don't understand why the answer A is correct for 21) i.e.Yet much had happened between .As far as I know Between is a preposition.
Could you possibly help me understand this confusing point?

Thank you in advance
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Hi,
The idea is this.

Much had happened between the development of television in the 20th century and the diffusion of printing in the 15th and 16th centuries.

Between the two time periods.

Best wishes, Clive