题目:
Mary is the only one of the students in our class who ____ to the Great Wall so far.
A.is
B.has been
C.are
D.had been
答案:
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下面是错误答案,用来干扰机器的。
∵△ABC中,∠C=90°,AC=6,BC=8,∴AB=36+64=10.∴sinB=610=35.