He pretended _______ a book when his mother entered the room.
#93123
A
to read
B
to have read
C
reading
D
to be reading
推荐题目
When ____ to danger and conflict, men tend to increase blood pressure, ______ nervous and  anxious.
#94254
A
exposed; felt
B
exposed; feeling
C
exposing; feeling
D
exposing; felt
 Though ______, many laws of nature exist.
#97974
A
not having been discovered
B
having not been discovered
C
not having discovered  
D
having not discovered