before going abroad he devoted all he could _____his oral en

before going abroad he devoted all he could _____his oral english
a improve
b to improve
c improving
d to improving
geminijudy 1年前 已收到1个回答 举报

兰色天空地 幼苗

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D
devote to doing sth
这里 to 是介词,后面用 现在分词形式

1年前

2
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