题目
题型：不详难度：来源：
| A．had discovered | B．had been discovered |
| C．has discovered | D．has been discovered |
答案
解析
核心考点
试题【If Newton lived today, he would be surprised by what _______ in science and tech】；主要考察你对一般现在时等知识点的理解。[详细]
举一反三
When the old man_____to walk back to his house，the sun____itself behind the mountain．
| A．was starting；hid | B．had started；had already hidden |
| C．had started；was hiding | D．started；had already hidden |
--- Listen! It is raining.
--- Oh, really! I ________ it at all.
| A．didn’t realize | B．don’t realize |
| C．haven’t realized | D．hadn’t realized |
There ________ no water for 2 days, the travellers were all thirsty.
| A．having been | B．had been | C．is | D．was |
— Has Yang Liping returned from Yunnan yet? I’d like to meet her.
— Sorry. She _______ back here only for last weekend.
| A．has been | B．would be | C．had been | D．was |
— Mum, I really think Dad should have a break and get relaxed.
— Yes. He _______ too long.
| A．read | B．has been reading | C．had read | D．is reading |
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