I am looking after little Tom today. He’s been in my house _________ 8:00 this morning.
#45997
A
at
B
since
C
for
D
till
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 Look at the library. It's    our classroom.
#47530
A
in the front of
B
on front of
C
in front of
D
on the front of
 I’m going to Beijing ______the 12th.
#46936
A
in
B
on
C
at
D
For