I find the lecture I attended in the Nanjing Normal University yesterday difficult _____. 
#95963
A
understand
B
being understood
C
understood
D
to understand
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______ which university to attend, the girl asked her teacher for advice.
#90210
A
Not knowing
B
Knowing not
C
Not known
D
Known not
          in a white uniform, he looks more like a cook than a doctor.
#94329
A
Dressed
B
to dress
C
Dressing
D
Having dressed