___ the invention of the steam engine, the industrial revolution played a vital role in human history．
#95687
A
Originating in
B
Originated in
C
To originate in
D
Being originated in
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There are lots of plastic bags ____ in the river, ____ it very dirty.
#92547
A
floating; making
B
to float; made
C
being floated; made
D
floated; making
—Is Bob still performing?—I'm afraid not.He is said ________ the stage already as he has become an official.
#89171
A
to have left
B
to leave
C
to have been left
D
to be left
________that he made an obvious mistake，Jeff went on with his speech.
#93256
A
Not realized
B
Not realizing
C
Not to realize
D
Not to have realized