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

2、单选题：
Never in my life ___ such a thing.
选项：
A:did I hear of or seen
B:have I heard of or seen
C:I had 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:began he
B:had he begun
C:does he begin
D:did he begin
答案: 【did he begin】

4、单选题：
Only when thousands of flowers bloom together ___ .
选项：
A:can spring be considered here
B:spring will be considered here
C:spring be considered here
D:could spring be considering 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:So was strange
C:Strange so was
D:Was so strange
答案: 【So strange was】