The maths problem remained confusing to the boy although __________ over and over.
| A．explaining | B．being explained | C．explained | D．having explained |
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In one corner of the garden there stands a little board，_______“Keep off the grass．”
| A．On which writes | B．it says |
| C．on which is read | D．which reads |
—Are you still very busy？
—Yes，I ______ the report for the manager and it won’t take long．
| A．have just finished | B．am just finishing |
| C．had just finished | D．am just going to finish |
Are there any restaurants in Beijing _____ authentic Mexican food?
| A．serve | B．that serving | C．that serve | D．serves |
_____ is expected, according to the online survey, is that prices of the houses won’t rise any more．
A．What |
B．It | C．As | D．Which |
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