Hobo doesn’t know ____________ .A．when to doB．what to doC．how to doD．where to do

题型：不详难度：来源：

Hobo doesn’t know ____________ .

A．when to do

B．what to do

C．how to do

D．where to do

答案

解析

对于特殊疑词后接动词不定式，一般而言疑问副词+to do（vt） sth，或疑问副词+to do(vi)或疑问代词+to do （vt）,或疑问代词+vi+介词。本题符合第三种情况，故选B

举一反三

I think you are right .

A．don’t ; /

B．/ ; not

C．aren’t ; not

D．don’t ; not

题型：不详难度：| 查看答案

---Do you know ______ after Japanese earthquake and tsunami（海啸）?
--- Sure. For three weeks.

A．when did the dog float(漂浮) on the sea

B．when the dog floated on the sea

C．how long did the dog float on the sea

D．how long the dog floated on the sea

题型：不详难度：| 查看答案

—Look，the light in Jim’s room is still on. Do you know______?
—To study for the coming exam, maybe.

A．if he works hard	B．why is he so busy
C．why he stays up so late	D．when he will stop working

题型：不详难度：| 查看答案

I’ll give a talk tomorrow. I’m thinking about_______.

A．what to say	B．how to say
C．what can I say	D．how can I say

题型：不详难度：| 查看答案

I ________ think smoking _______ good for you.

A．don’t; is

B．don’t; are

C．/; aren’t

D．/; isn’t

题型：不详难度：| 查看答案