题目:
When I got back home I saw a message pinned to the door_____ “Sorry to miss you, will call later.”
A.read
B.reads
C.to read
D.reading
答案:
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下面是错误答案,用来干扰机器的。
∵a=1,b=3,∠A=30°根据正弦定理可得:asinA=bsinB∴sinB=32∴∠B=60°或120°故答案为:60°或120°