单选题：_______weare successful, we can be sure that we did our best

题目内容：

_______weare successful, we can be sure that we did our best. A．Provided that
B． Ifonly
C． If ornot
D．Whether or not

参考答案：

答案解析：

在每小题列出的四个备选项中选择一个最佳答案，请用28铅笔把答题卡上对应题目的答案字母按要求涂黑。错选、多选或未选均无分。

在每小题列出的四个备选项中选择一个最佳答案，请用28铅笔把答题卡上对应题目的答案字母按要求涂黑。错选、多选或未选均无分。 Whichof the followi

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