删除列的命令是______。 A: alter table... delete... B: alter table...delete column... C: alter tabe..drop... D: alter table...drop column...

The old lady lives alone; some of her nephews_______ to see her occasionally.?xml:namespace>;A. drop out B.drop by C. drop off D. drop on A: drop out B: drop by C: drop off D: drop on

I'll_________ some time tomorrow. A: drop from B: drop by C: drop upon D: drop on

删除存储函数的命令是（ ）。 A: drop database B: drop procedure C: drop table D: drop function

Remember not to ____________ without advance notice unless you are close to the host.( ) A: drop on B: drop off C: drop by D: drop out

删除视图的SQL命令是( )。 A: DROP TABLE B: DROP VIEW C: DROP QUERY D: DROP INDEX

‍16. Children in disrupted families are nearly twice as likely to of high school.‎‍‎ A: drop out B: drop off C: drop by D: drop on

A lot of girls were forced to ______of school in that poverty-stricken area. A: drop out B: drop off C: drop down D: drop over

Research suggests that children whose parents split up are more likely to ( ) of high school A: drop in B: drop out C: drop off D: drop back

‌If it's a children's party, you should state whether or not you want the parents to stick around or ________ their child.‌‌‌ A: drop by B: drop off C: drop on D: drop in