单选题$str = "My name is Jack， and what is your name？"；echo substr_count （$str，“name”）；程序的输出结果为（）。A1B2C3D4
单选题
$str = "My name is Jack， and what is your name？"；echo substr_count （$str，“name”）；程序的输出结果为（）。
A
1
B
2
C
3
D
4
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