试题与答案

She is looking forward________to the bal

题型:选择题

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.

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