1编号：50846题型：单选题测试正确率：66.9%
is dangerous for us to swim in the river alone.
2编号：49195题型：单选题测试正确率：72.27%
usually takes Mum about half an hour to cook supper.
3编号：49194题型：单选题测试正确率：53.9%
is really hard them to climb such a high mountain.
4编号：48129题型：单选题测试正确率：71.3%
It’s difficult English well.
5编号：46691题型：单选题测试正确率：58.33%
It usually takes me about five minutes the school library.
6编号：44211题型：单选题测试正确率：61.52%
is dangerous to swim in the river alone.
7编号：28965题型：单选题测试正确率：61.74%
It Li Dan ten minutes home.
8编号：4808题型：单选题测试正确率：29.61%
I find difficult to learn math.
9编号：3990题型：单选题测试正确率：66.08%
It’s really important ______ English.
提醒:
