The time _________ I first spend with Nelson Mandela was a very difficult period of my life.
| A． when | B． which | C． of which | D． at which |
Only then __________ how much damage had been caused.
| A．she realized | B．she had realized |
| C．had she realized | D．did she realize |
—It’s burning hot today, isn’t it?
—Yes. __________ yesterday.
| A．So was it | B．So it was |
| C．So it is | D．So is it |
So difficult __________ it to work out the problem that I decided to ask Tom for advice.
| A．I did find | B．did I find |
| C．I have found | D．have I found |
__________ homework did we have to do that we had no time to take a rest.
| A．So much | B．Too much |
| C．Too little | D．So little |
—Did Linda see the traffic accident?
—No, no sooner __________ than it happened.
| A．had she gone | B．she had gone |
| C．has she gone | D．she has gone |