问题
填空题
选用because或because of填空。
1. _____ his bad leg, he couldn't walk so fast as others.
2. They didn't go swimming _____ it was raining hard.
3. —Why can't you do it now?
—_____ I'm too busy.
4. He didn't come today _____ his illness.
答案
1. Because of 2. because 3. Because 4. because of