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單項選擇題

You look（） What（）you（）

A.tire；did；do
B.tiring；have；done
C.tired；do；do
D.tired；have；been doing

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單項選擇題

You must explain（）how they succeeded（）the experiment.

A.of us；for
B.at us；at
C.to us；in
D.for us；to

單項選擇題

We（）every day when we were children.

A.used to swim
B.used to swimming
C.use to swim
D.use to swimming