he has been working so hard . __________ he could answer such a difficult question. 
#3464
A
No wander
B
No wonder
C
why
D
because
推荐题目
“ What is your name?” “______”
#22846
A
My name is Jim Green
B
My name is Green Jim
C
Jim Green is I
D
This is Green Jim here.
– Can you play with us, Tina?-- ____, I have ____ my sister. She can’t be at home alone.
#22281
A
Sure; to babysit
B
Sure; babysit
C
Sorry; to babysit
D
sorry; babysit