单项选择题

Don't be afraid of asking for help ______ it is needed.

A．unless
B．since
C．although
D．when

<上一题目录下一题>

热门试题

单项选择题

Why didn't the truck owners fight to get away the melons（）

A．The old farmer was a strong enemy.
B．The price offered for the melons was very low.
C．It was hard to start a fight against friendly people.
D．It was necessary to get the truck out before anything.

单项选择题

What would be the best title for the passage （）

A．The Greatest Killer in the West
B．Heart Disease: Treat or Prevent
C．Modern Technology and Heart Surgery
D．Heart Surgery: Advantage and Disadvantages