I had a really hard time ____(study) science this semester.

I had a really hard time ____(study) science this semester.
I had a really hard time ____(study) science this semester.

I had a really hard time ____(study) science this semester.
studying
have a hard time
在口语中有两个很好用的句型表示“无法,有困难”,一个是has problem doing something,另一个是has a hard time doing something.比如说,有人提议要去看The Lord of the Rings这部电影的首映,你就可以劝阻他“I think we will have a hard time getting tickets.",就是说"我觉得我们很难买到票.”

应该填写：studying,英语习惯说have a good time in doing something ，这里省去了 in.翻译为：这学期我的理科学的不容易。

应该填写
studying

翻译为：这学期我学科学课学得很难
have a　hard time doing sth 做某事很难

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填 studying
have a hard time （in） doing sth 做某事艰难，in可省略
I had a really hard time studying science this semester.
翻译：
这个学期学习科学课很困难啊！

应该是studying