單項(xiàng)選擇題

Mary forgot（）a letter to her mother, so she wrote to her just now.

A.writing
B.to write
C.to have written

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單項(xiàng)選擇題

He is the man（）dog bit me.

A.that
B.which
C.whose

單項(xiàng)選擇題

Before she left on the trip, she（）hard.

A.had trained;
B.has trained
C.would trained

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