在初中阶段，英语语法的学习是一个重要的组成部分。其中，现在完成时是学生需要掌握的一个重点和难点。为了帮助大家更好地理解和运用这一时态，我们特意准备了以下练习题以及详细的答案解析。
一、选择题
1. I _______ my homework already.
A) have finished
B) finish
C) finished
D) am finishing
答案：A) have finished
解析：已经完成某件事情，强调对现在的影响，因此使用现在完成时。
2. She _______ the book for two weeks.
A) has kept
B) kept
C) keeps
D) is keeping
答案：A) has kept
解析：表示从过去持续到现在的动作或状态，用现在完成时。
3. They _______ to the park yesterday.
A) went
B) go
C) have gone
D) had gone
答案：A) went
解析：描述过去发生的事情，用一般过去时。
4. He _______ the movie last night.
A) has seen
B) sees
C) saw
D) will see
答案：C) saw
解析：描述过去的动作，用一般过去时。
5. We _______ this school since three years ago.
A) have been in
B) were in
C) are in
D) will be in
答案：A) have been in
解析：表示从过去开始并持续到现在的状态，用现在完成时。
二、填空题
6. Tom _______ (study) English for five years.
答案：has studied
解析：强调从过去到现在一直在做的事情，用现在完成时。
7. She _______ (read) three books this month.
答案：has read
解析：表示这个月内已经读过的书，强调对现在的影响。
8. They _______ (visit) many places since they came here.
答案：have visited
解析：表示自他们来这儿以来所访问过的地方。
9. The children _______ (play) football for an hour.
答案：have been playing
解析：表示从过去某一时间开始一直持续到现在的动作。
10. My father _______ (work) in this company for ten years.
答案：has worked
解析：强调从过去开始并持续到现在的职业经历。
通过以上练习题，希望大家能够更加熟练地掌握初中英语中现在完成时的用法。记住，现在完成时主要用于表达过去发生的动作对现在产生的影响或者从过去某一时刻开始并持续到现在的状态。希望这些题目能帮助你在考试中取得更好的成绩！
