问题
You can’t borrow books from the school library _______ you get your student card.
A:before
B:if
C:while
D:as;
B:if
C:while
D:as;
正确答案是：
同类题型
They were exhausted , so that they decidedtotwo days ____.
“I hope _________ play soccer with ustomorrow. ”“Yes, I hope _________. ”
Which would you like to drink, coffee or orange juice?—___________. Please give me a cup of tea.
More and more problems appeared ________the increasinguse of short messages sent by cell phones