—How unhappy your roommate looks!
—Yes, but he's not willing to tell me what it is _______ is troubling him.
| A．what | B．which | C．as | D．that |
相关试题
It is often said that____teachers have ____very easy life.
| A．不填；不填 | B．不填；a | C．the; 不填 | D．the; a |
In ____late 19th century, Europe changed ______great deal and was playing important roles in ______international trade. 
| A．the; a; the | B．the; the; 不填 | C．the; a; the | D．the; a; 不填 |
--- Why do you suggest we buy a new machine?
--- Because the old one has been damaged ___________.
| A．beyond reach | B．beyond repair | C．beyond control | D．beyond description |
－When do we need to pay the balance?
－__________ September 30.
| A．In | B．By | C．During | D．Within |
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