题目内容
从所给的四个选项中选择最佳答案
______ you understand the rule, you will have no further difficulty.
[
]A
.Then B.However C.As D.Once
答案:D
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题目内容
从所给的四个选项中选择最佳答案
______ you understand the rule, you will have no further difficulty.
[
]A
.Then B.However C.As D.Once