While Mary ___ a letter, the children were playing outside.
#39841
A
wrote
B
writes
C
is writing
D
was writing
推荐题目
Mr. Green          his lessons when I went into his office.
#36608
A
prepares
B
prepared
C
is preparing
D
was preparing
Tina _______ England with her parents three years ago. 
#38005
A
visits
B
visited
C
will visit
D
was visiting
 Tom ________ a letter from Terry for a long time.
#42664
A
didn’t receive
B
hasn’t got
C
didn’t have
D
hasn’t heard
If farmers          trees and forests, giant pandas        nowhere to live.
#38962
A
cut down; have
B
will cut down; will have
C
will cut don; have
D
cut down; will have