Android Studio3.5在编译项目出现连接不上gradle该怎么办？

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    repositories {
        //google()
        //jcenter()
        maven { url ‘https://maven.aliyun.com/nexus/content/repositories/google‘ }
        maven{ url ‘http://maven.aliyun.com/nexus/content/groups/public/‘ }
        maven{ url ‘http://maven.aliyun.com/nexus/content/repositories/jcenter‘}
    }
    dependencies {
        classpath ‘com.android.tools.build:gradle:3.5.3‘
        
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        maven { url ‘https://maven.aliyun.com/nexus/content/repositories/google‘ }
        maven{ url ‘http://maven.aliyun.com/nexus/content/groups/public/‘ }
        maven{ url ‘http://maven.aliyun.com/nexus/content/repositories/jcenter‘}
        //google()
        //jcenter()
        
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}