(1)This time yesterday Jack_____(mend) his bike.(2)I____(write) a letter at ten last night.

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• (1)This time yesterday Jack_____(mend) his bike.(2)I____(write) a letter at ten last night.
• (1)This time yesterday Jack_____(mend) his bike.(2)I____(write) a letter at ten last night.
• 已知sin(π/4－α)＝2/3,π/4＜α＜π/2,则sin2α＝
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