下列（ ）语句使复选框Check1变成灰色

一张表的sex字段是int类型，为限制输入的值只能是0或1，以下约束不正确的是（）。 A: check（sex=0orsex=1） B: check（sexbetween0and1） C: check（sexin（0，1）） D: check（sex=（O，1））

Private Sub Form_Click() Dim Check, Counter Check = True Counter = 0 Do Do While Counter < 20 Counter = Counter + 1 If Counter = 10 Then Check = False Exit Do End If Loop Loop Until Check = False Print Counter; CheckEnd Sub程序运行后，单击窗体，输出结果为______。 A: 15 0 B: 20 -1 C: 10 True D: 10 False

He had gone to the reception desk, presumably to ______. A: check on B: check into C: check off D: check out

How to check the quality during production（） A: Check every one. B: Take samples to check it. C: Check it at random.

To show your ticket and get your seat at the airport is to _________. A: check out B: check off C: check in D: check on

Could you please _______over there in the front office? A. check in B. check off C. check on D. check about

What do you have to do before leave hotel（） A: check out B: check in C: check ove D: check on

You must_________at the airport an hour before your plane leaves. A: check in B: check out C: check with D: check over

Hello. I would like to ___________. I booked a room at this hotel online. A: check out B: check in C: check on D: check over