问题
单项选择题
Hearing a（）noise in the backyard, Pamela went there to have a look.
A.cracking
B.crack
C.cracked
D.cracker
答案
参考答案：A
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Hearing a（）noise in the backyard, Pamela went there to have a look.
A.cracking
B.crack
C.cracked
D.cracker
参考答案：A