问题
选择题
.
The house caught ______ fire while they were away. It must have been set ______ on fire by someone.
A．a; a
B．a; /
C．/; a
D．/;/
答案
答案：D
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.
The house caught ______ fire while they were away. It must have been set ______ on fire by someone.
A．a; a
B．a; /
C．/; a
D．/;/
答案：D