[ Conditional Tenses ]
Recognize the conditional perfect continuous sentence: If he had been practicing regularly, he would have improved his skills.
A. If he had been practicing regularly, he would have improved his skills.
B. If he had been practiced regularly, he would have improved his skills.
C. If he had been practicing regularly, he would improve his skills.
D. If he has been practicing regularly, he would have improved his skills.

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