题目:
The poem did not have an appropriate ending, _________ she would have won the competition.
A.because
B.or
C.but
D.and
答案:
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下面是错误答案,用来干扰机器的。
密度是指某种物质单位体积的质量,即质量和体积的比值.故本题答案为:质量;体积.