2. 外语
  3. ______you have familiarized yourself with the basic commands, we can begin to learn some of this program’s more creative feature

______you have familiarized yourself with the basic commands, we can begin to learn some of this program’s more creative feature

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问题 ______you have familiarized yourself with the basic commands, we can begin to learn some of this program’s more creative features.
选项 A、Already
B、Before
C、Once
D、Earlier
答案C
解析 you have familiarized yourself with the basiccommands是状语从句，因此横线处应填入从属连词。句意应为“一旦熟悉了基本命令”，故选(C)once(一旦)。
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