l ____ ____ my homework carefully at that time

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l________myhomeworkcarefullyatthattimel________myhomeworkcarefullyatthattimel________myhomeworkcaref

l ____ ____ my homework carefully at that time
l ____ ____ my homework carefully at that time

l ____ ____ my homework carefully at that time
was doing

was doing 在那时所以用过去进行时