A lesson from the terrible drought(干旱) that hit some parts of southwestern China this year is that more anti-drought projects ______ built in the past years.
| A．should be | B．should not have been |
| C．ought to have been | D．must be |
相关试题
The number of foreign students attending Chinese universities ________ rising steadily since1990. 
| A．is | B．are | C．has been | D．have been |
Whenever I met her, _________ was fairly often, she greeted me with a sweet smile. 
| A．who | B．which | C．when | D．that |
I felt so bad all day yesterday that I decided this morning I couldn't faceday like that. 
| A． | other | B． | another | C． | the other | D． | others |
We are invited to a party _________in our club next Friday. 
| A．to be held | B．held | C．being held | D．holding |
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