.
Tom_______at least three coffees every day until his doctor told him to limit it to one.
| A．had drunk | B．drank | C．has been drinking | D．has drunk |
—It is _______he often fails in exams_______ makes his parents worried about him.
—So, he has to work whole-heartedly.
| A．what, that | B．that, what | C．that, that | D．/, that |
In some countries, ______ is called “equality” does not really mean equal rights for all people.
| A．that | B．what | C．which | D．how |
The police were seeking more information to find out ______ the rich merchant.
| A．who was it that killed | B．who it was that killed |
| C．it was who killed | D．who was it killed |
_____ puzzles me most is that I don’t know ______ the difference between the two lies.
| A．What, how | B．What, where | C．That, what | D．How, which |
Determination is a kind of basic quality and this is _____ it takes to do jobs well.
| A．why | B．that | C．which | D．what |