You’d better wear a pair of comfortable trainers when ________a long walk. 
#41330
A
you take
B
taking
C
to take
D
A&B
推荐题目
The man you referred to _____ just now.
#72229
A
comes
B
come
C
coming
D
came
       tomorrow, we will set sail for Canada.
#69959
A
However the weather is like
B
However is the weather like
C
Whatever is the weather like
D
Whatever the weather is like