从以下4个小题中，选出与各句画线部分意思相同或相近、并能替换画线部分的选项。（共4小题，每小题1分；计4分）
| A. did nothing B. were important C. as long as D. is less hard-working than |
The excellent performers played a good role in this interesting show.
In the past summer vacation, I didn’t do anything special.
Mike doesn’t study as hard as his young sister.
You will get better grades if you choose the right way of learning.