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單項(xiàng)選擇題

Mathematics（）study or science of numbers.

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

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

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

單項(xiàng)選擇題

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

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