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【单选题】
create table tb_score(sid int not null ,cid int not null ,grade decimal(10,2) default 0,mark varchar(100)); 向学生成绩表中插入如下行时,()数据可以被插入数据库。A.
（ null,1001,88,'语文成绩'）
B.
(2018001,1002,null,null)
C.
('2018001','1002',99,'数学成绩')
D.
(2018002,null,100,'英语成绩')
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举一反三
【单选题】Jane, I would like to meet on Tuesday, but if my plane is delayed I will see you at Friday's meeting. John
A.
John has to postpone his meeting until Friday.
B.
John will be late for his meeting on Tuesday.
C.
John hopes to see Jane on Tuesday.