持用()乘车证免打查验标记。
A.软席
B.硬席
C.临时定期
D.探亲
参考答案:C
—Do you _______ an English class every day?
—Yes. We _______ it just now. [ ]
A. have; have
B. had; had
C. have; had
D. had; have
常用的防污闪措施有()。
A.增加爬距;
B.加强清扫;
C.涂覆憎水性涂料;
D.定期测试盐密。