1、单选题：

Seldom ___ TV during the day.
选项：
A: they watch
B:are they watching
C:have they watched 
D:do they watch
答案: 【do they watch】

2、单选题：

Never in my life ___ such a thing.
选项：
A:I had heard of or seen
B:did I hear of or seen
C:have I heard of or seen 
D:I have heard of or seen
答案: 【have I heard of or seen 】

3、单选题：

Not until his comrades criticized him ___ to admit his mistake.
选项：
A:does he begin
B:had he begun
C:did he begin
D:began he
答案: 【did he begin】

4、单选题：

Only when thousands of flowers bloom together ___ .
选项：
A:spring will be considered here
B:could spring be considering here
C:spring be considered here
D:can spring be considered here 
答案: 【can spring be considered here 】

5、单选题：

___ his appearance that no one could recognize him.
选项：
A:So strange was
B:Was so strange
C:So was strange
D:Strange so was
答案: 【So strange was】