To save the drowning child, the boy plunged into the icy water without hesitation, ________ his own safety．

A.
despite of
B.
regardless of
C.
unaware of
D.
because of

B
解析：
本題考查介詞詞組的用法及區(qū)別。regardless of意思是“不管，不顧”；
despite of“盡管”，表示讓步；
unaware of意思是“沒有覺察到”；
because of意思是“因?yàn)椤保硎驹颉?

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