问题
选择题
It's time _________ us _________ go to school.
[ ]
A. for; /
B. of; to
C. for; to
D. /; /
答案
答案：C
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It's time _________ us _________ go to school.
A. for; /
B. of; to
C. for; to
D. /; /
答案：C