NEVER BEFORE ________ AS ACCELERATED AS THEY ARE NOW DURING THE TEC...

4. Never before ________ as accelerated as

they are now during the technological age.

-

o đ

c bi

t ( o v n ch ng): Adv + V+ S

(noun)

A. have historical changes been

B. have been historical changes

C. historical changes have been

D. historical have changes been

Eg:

4

C

ác đ

ng t

theo sau là “

to V/V/V_

ing”