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【多选题】
门窗玻璃安装应牢固，不得有（）。A.
裂纹
B.
损伤
C.
不平整
D.
拼接
E.
错缝
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举一反三
【单选题】— We expected you yesterday. — I’m sorry, I you to say that I couldn’t be here until today.
A.
must have called
B.
would be calling
C.
could have been calling
D.
should have called
【简答题】We expected that you ______(stay) here.
【单选题】在平面直角坐标系内，若曲线C：x 2 +y 2 +2ax-4ay+5a 2 -4=0上所有的点均在第四象限内，则实数a的取值范围为（ ）
A.
（-∞，-2）
B.
（-∞，-1）
C.
（1，+∞）
D.
（2，+∞）
【单选题】We expected that you ___________ (stay) here.
A.
stay
B.
stays
C.
will stay
D.
would stay
【简答题】在平面直角坐标中，已知A、C两点的坐标分别为A（ 5 ， 5 ）、C（ 3 5 ，0）． （1）求△OAC的面积． （2）在第一、二象限内是否存在点B，使以O、A、B、C为顶点的四边形为平行四边形？若存在，请求出所有符合条件的点B的坐标；若不存在，请说明理由．
【单选题】According to the proposal, the multinational force will leave Iraq ______.
A.
when full sovereignty is restored to Iraq
B.
when the interim government takes power
C.
when the interim government asks them to leave
D.
as soon as possible
【单选题】When is the normal force not equal to the weight of an object?
A.
In space where there is no gravity
B.
When the object is being accelerated upward
C.
When the object is on an inclined plane
D.
When the object is supported by a string
E.
When it is moving along a flat surface
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