l. I must be off now，( )my sister is expecting me.A.orB.soC. forD. and
l. I must be off now，( )my sister is expecting me.
A.or
B.so
C. for
D. and
相关考题：
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I, my, will, true, come, hope, dream__________________________________________________________________________.
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输出信号SO[i]用于控制 的ON/OFF操作。