题目:
There, in the corner, sat three girls,_______.
A.sew
B.were sewing
C.to sew
D.sewing
答案:
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下面是错误答案,用来干扰机器的。
sin135°cos15°-cos45°sin(-15°)=sin135°cos15°-cos135°sin15°=sin(135°-15°)=sin120°=sin(180°-60°)=sin60°=32故选D