Half an hour later, Lucy still couldn't get a taxi ______the bus had dropped her.
A. until
B. when
C. although
D. where
查看答案
If you don't understand something, you may research, study, and talk to other people______ you figure it out.
A. because
B. though
C. until
D. since
My grandfather still plays tennis now and then, ______ he is in his nineties.
A. as long as
B. as if
C. even though
D. in case
______scientists have learned a lot about the universe, there is much we still don't know.
A. Once
B. Since
C. Though
D. Unless
GT Designer3中部件的移动方法 (由位置软元件控制)可选择以下三种移动方法。
A. 坐标
B. 直线
C. 点指定