--- Why does the lake smell terrible?
--- Because large quantities of water _________.
| A．have polluted | B．is being polluted |
| C．has been polluted | D．have been polluted |
相关试题
----- “Is there _____ here?”
------ “No, Bob and Tim have asked for leave.”
| A．anybody | B．everybody | C．somebody | D．nobody |
Good luck to you, and _____ all your wishes come true.
| A．can | B．may | C．must | D．should |
He ran as fast as he could _____ to catch the bus.
| A．hope | B．to hope | C．hoping | D．hoped |
The system has been designed to give students quick and easy_____to the digital resources of the library.
| A．access | B．passage | C．way | D．approach |
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