经典战棋策略游戏:It was because of their hard work ( )they completed the task in task in seven weeksinstead of nine.

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A which
B when
C who
D that

D that表示强调.

D
that引导主语从句
it是形式主语
真实顺序是这样：That they completed the task in task in seven weeks instead of nine was because of their hard work。
因为主语太长，所以需要形式主语it。

that
此句是强调句。
判断方法把It is 和that去掉，句子仍然成立。

D that
是强调句。

that it is*****that 是固定用法,强调句型

It was because of their hard work ( )they completed the task in task in seven weeksinstead of nine. I was late because there was a lot of t_____ He was born ____the morning of december 8th Because it was raining, we postponed the match until tomorrow. We were nervous because it was a new business because of my job I was always the one buying it was the age of wisdom it was nice of them to call perhaps it was her youth that made the difference because ,even when I was very young but It was because I was getting older.语法有错误吗？