在浩如烟海的考研英语二备考材料中，万学海文考研英语二答案以其精准解析和详尽注释，成为了无数考研学子心中的良师益友。以下是对某一道典型题目的答案：
问题：以下哪一项是正确的语法用法？
A. It is because of his hard work that he achieved success.
B. It is because of his hard work that he has achieved success.
C. It is because of his hard work, which he achieved success.
D. It is because of his hard work, and he achieved success.
答案：B. It is because of his hard work that he has achieved success.
解析：此题考查强调句型。强调句型的一般结构为：“It is/was+被强调部分+that/who+其他”。由于句子中的“achieved success”是一个完成的动作，因此需要使用现在完成时，即“has achieved”。故选B。
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