He has been collecting coins _______ he was seven years old.
#58296
A
because
B
while
C
when
D
since
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—All the isatis root(板蓝根) is sold out!—People are crazy! experts say there is no use eating isatis root to preventH7N9, some people still don’t believe it.
#56593
A
Although
B
Unless
C
As a result
D
In order that
