Mr. Smith was so angry at all ________ Robert was doing _________ he walked out angrily. 
#67672
A
that; what
B
that; that
C
which; which
D
what; that
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---How long have you been studying at this school? --- I have been studying here­­­­____.
#41315
A
since I was thirteen years old
B
when I was thirteen
C
at the age of thirteen
D
after I was thirteen