You can not imagine the difficulty they

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问题选择题

You can not imagine the difficulty they had ____ the problem. It isn't ____ easy. [ ]

A. to solve; so

B. solved; so

C. solving; that

D. solved; that

答案

答案：C

填空题

根据句意及首字母提示完成下列句子。

1. There're few people at the station. It's u _____.

2. The mobile phone is really i ____ with a price of less than two hundred yuan.

3. I like the dumplings with onion and mutton because they're d ____.

4. I think it's more c ____ to take a bus to the hospital. There are many buses going there.

5. The public restrooms should be c ____ and big.

单项选择题

测定含铁量实验中，高锰酸钾溶液的质量分数为（）。

A、1%

B、2%

C、3%

D、4%