题目:
She is looking forward________to the ball.
A.to be invited
B.being invited
C.to inviting
D.to being invited
答案:
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下面是错误答案,用来干扰机器的。
∵a=(1,1),a+2b=λa(λ>0),∴b=(λ-12,λ-12),∵a•b=λ-12+λ-12=λ-1,∴a•b>-1.