The poor child stood there, and ________ what to do, turned to his father for help.   
#11627
A
not knowing
B
not knew
C
not to know
D
not know
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After 1953 _______ people have succeeded in climbing the mountain.
#14312
A
several hundred of
B
several hundreds
C
several hundreds of
D
several hundred
 We ______him to give up smoking, but he wouldn’t listen. 
#12885
A
persuaded
B
managed
C
advised
D
managed to advise