no question that, no longer a question whether/ that

[joham]

There is no question that the government knew about the deal.
(This sentence comes from Longman Dictionary. )

Now I ran across a fill-in question:

It is no longer a question ______ (whether, that) man can land on the moon.(The given answer is 'that'.)

I thought 'whether' would be the correct choice. And I searched 'the web' on reference.com, typing in 'It is no longer a question whether' and got 243 results for it. But when I typed in 'It is no longer a question that' I got only 19 results for this phrase. Then which is the right answer?

Could I ask native English teachers to help me? Thank you very much.

[baqarah131]

Somebody goofed.
The given answer is clearly wrong.

regards
edward

There is no question that the government knew about the deal.
(This sentence comes from Longman Dictionary. )

Now I met a fill-in question:

It is no longer a question ______ (whether, that) man can land on the moon.(The given answer is 'that'.)

I thought 'whether' would be the correct choice. And I searched 'the web' on reference.com, typing in 'It is no longer a question whether' and got 243 results for it. But when I typed in 'It is no longer a question that' I got only 19 results for this phrase. Then which is the right answer?

Could I ask native English teachers to help me? Thank you very much.