Tom concluded his lecture ________ that he couldn’t emphasize enough how important our efforts were.
#94878
A
to say
B
saying
C
said
D
having said
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________ many times, he still couldn’t understand it.
#88586
A
Told
B
Being told
C
Having been told
D
Having told
I'm afraid that I can't make myself ___ because of my poor English. 
#94312
A
understand
B
understanding
C
to understand
D
understood