问题
选择题
He has been collecting coins _______ he was seven years old.
A．because
B．while
C．when
D．since
答案
答案：D
考查连词。句意：自从他七岁的时候他就一直收集硬币。Since自从，故选D。
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He has been collecting coins _______ he was seven years old.
A．because
B．while
C．when
D．since
答案：D
考查连词。句意：自从他七岁的时候他就一直收集硬币。Since自从，故选D。