______  it is getting dark.，we’d better hurry
A．AndB．ButC．SinceD．Unless
C               
             
試題分析：考查連詞。A. And并且；B. But但是；C. Since因?yàn)椋籇. Unless除非 ； 句意：因?yàn)樘旌诹耍覀冏詈每�。Had better do 最好做某事。兩個(gè)句子之間是因果關(guān)系，故選C項(xiàng)。         
考點(diǎn) : 考查連詞
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