根据句子的意思.用work up的适当形式填空. Tom couldn't the courage to jump off the high rock and
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根据句子的意思，用work up的适当形式填空。
Tom couldn't ________ the courage to jump off the high rock and into the lake．
试题答案
答案：work up
根据句子的意思，用work up的适当形式填空。
Tom couldn't ________ the courage to jump off the high rock and into the lake．
答案：work up