The sun _____ in the east.
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She _____ have a little brother. She is the only childin her family.
A. isn’t
B. don’t
C. doesn’t
When Bill _____, please ask him to wait for me.
A. comes
B. coming
C. came
—What _____ your father do?—He_____ a famous singer.
A. do; is
B. does; is
C. does; are
在数控程序中,GOO指令命令刀具快速到位,但是在应用时( )
A. 必须有地址指令
B. 不需要地址指令
C. 地址指令可有可无
D. 可以是其他符号