____ aware of the danger ahead, he took on the task without hesitation.
A．IfB．ThoughC．SinceD．As
B
考查連詞。If 如果，Though 雖然，Since 自從，As 因為，句意：雖然他提前意識到了危險，但是他毫不猶豫的承擔(dān)了任務(wù)。所以選B。
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