（），we would have finished it then.

A:If had we had better equipment B:Had we had better equipment C:Had had we better equipment D:We had had better equipment

What we have seen is ______.

A:from what we heard B:all what we heard C:to what we have heard D:from what we have heard

（　）succeed in everything we do.

A:Only by working hard can we B:By only working hard we can C:Only we can by working hard D:Only by working hard we can

______ succeed in everything we do.

A:Only by working hard can we B:By only working hard we can C:Only we can by working hard D:Only by working hard we can

We never dared to ask him a question ______

A:did we B:didn't we C:dared we D:daredn't we

We never dared to ask him a question（）

A:did we B:didn’t we C:dared we D:daredn’t we

What we have seen is ______.

A:from what we heard B:all what we heard C:to what we have heard D:from what we have heard

______ succeed in everything we do.

A:Only by working hard can we B:By only working hard we can C:Only we can by working hard D:Only by working hard we can