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單項選擇題

Mathematics（）study or science of numbers.

A.is
B.are
C.was
D.were

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單項選擇題

Mary told me that she（）to the supermarket before coming home

A.went
B.had gone
C.has gone
D.goes

單項選擇題

Many people watched the boys（）the mountain at that time.

A.climb
B.climbing
C.to climb
D.climbed

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