问题
Where are Tom and Mary–____ Tom _____ Mary is busy with theirhomework. You’d better play with.
A: how todo
B: what to doit
C:what todo
D: when to do
B: what to doit
C:what todo
D: when to do
正确答案是：
同类题型
________we went to visit Professor Smith,he________his research work.
Paper bags produced every year are ____ the world’sproduction of vehicles
There are many_________ animals in the zoo. Most of them are ______ cute.
There are few problems left I believe you can deal with them yourself
The traffic is moving very slowly as so many carson their way back to Shanghai.