— I'm afraid that we can't the math problem the teacher helps us.
— That's true.It's too difficult.
A．work on；ifB．work on；unless
C．work out；ifD．work out；unless
相关试题
We still know little about the Moon_________men have landed on it．（ ）
A．ifB．sinceC．althoughD．because
What a sunny day! Why not go cycling？
_________．（ ）
A．No， I don't mindB．You'd better not
C．That sounds greatD．It's my pleasure
I have some tickets for the football match． I called my friends to see_____．（ ）
A．where did they buy them
B．why they liked to go there
C．when did we go together
D．whether they'd like to go
In order to send the donations to the hospital as soon as possible， the drivers_____ stopped to eat or rest during the journey．（ ）
A．nearlyB．hardlyC．badlyD．mostly
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