He has been collecting coins _______ he was seven years old.
#58296
A
because
B
while
C
when
D
since
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“Show me your ticket, ________ I won’t let you in.” the guard(保安) said angrily.
#56497
A
so
B
or
C
but
D
and
You should keep working hard ____ you have passed the exam.
#56116
A
since
B
because
C
so
D
even though
