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
推荐题目
—How did she get infected?  —She _______ the viruses without any protection.
#12814
A
exposed to
B
had exposed to
C
was exposed to
D
been exposed to
lively
#13516
A
possible
B
universe
C
strike
D
chemical