问题

You ought to have learnt all these sentences by heart.— ____, but I forgot everything when I was asked to recite them in front of so many students. [ ]

A: So I ought to
B: So I did
C: So must I
D: So did I

正确答案是：

同类题型

You should study hard. No one can youa good future.

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as just the first stage of the robot design challenge, the finals _____ for 2015.

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