. The glass doors have taken the place of the wooden ones at the entrance, __________ in the natural light during the day. 
#98537
A
to let
B
letting
C
let
D
having let
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____ regular training in nursing,she could hardly cope with the work at first.
#95321
A
Not having received
B
Since receiving
C
Having not received
D
Not received
Jack became seriously ill after ________ in polluted air for many years.
#89778
A
breathed 
B
breath 
C
breathing 
D
to breathe