题目
题型：不详难度：来源：
| A．visit | B．are visiting | C．had visited | D．have visited |
答案
解析
核心考点
试题【Is this the first time that you _____ here?A．visitB．are visitingC．had visitedD．h】；主要考察你对一般现在时等知识点的理解。[详细]
举一反三
| A．have reminded | B．are reminded |
| C．were reminding | D．had been reminded |
The water will be polluted unless some measures _____.
| A．will be taken | B．are being taken | C．are taken | D．were taken |
With the gas _____, they had to quit the car and walked.
| A．has run out | B．running out | C．ran out | D．be run out |
| A．had been cancelled; which | B．have been cancelled; what |
| C．had been canceling; that | D．have been canceling; where |
| A．plays | B．should play | C．is played | D．is being played |
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