He has three children,         are doctors.
#68700
A
and two of whom
B
two of them
C
two of whom
D
two of which
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Please leave your phone number ______ we can get in touch with you in case of emergency. 
#68466
A
so that
B
on condition that
C
for fear that
D
so long as
It has been two years _________ he came to China. 
#41214
A
since
B
after
C
before
D
till
The poor girl       across the road       a car knocked her down.
#41276
A
walked; while
B
walked; since
C
was walking; until
D
was walking; when