优优班--学霸训练营 > 知识点挑题
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            • 1．
              Lucy ________(frequent) goes out for a trip.
              难度：中等
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            • 2．
              You’d better recite these words, because they are___________(frequent)  used.
              难度：中等
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            • 3．

              —I have had enough of endless exercises in maths, but it makes no difference.

              —Constant dripping wears away a stone. Keep working and g___________ you will make some progress.

              难度：中等
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