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單項選擇題

A long time ago, I（）in London for three years

A.had lived
B.have lived
C.lived
D.have been living

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單項選擇題

A large number of people（）present at the meeting, which was out of our expectation.

A.was
B.were
C.have
D.has

單項選擇題

A computer can only do（）you have instructed it to do.

A.how
B.after
C.what
D.when

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