With some technical problems to be solved, it may be a while _____ the system is

题型：模拟题难度：来源：

With some technical problems to be solved, it may be a while _____ the system is put into use.

[ ]

A. when
B. after
C. since
D. before

答案

举一反三

— What do you think I should wear for such a formal press conference?
— Dress ____ you like.

[ ]

A. how
B. what
C. whatever
D. however

题型：模拟题难度：| 查看答案

We like learning French, _____ we may never go to France.

[ ]

A. in case
B. however
C. even though
D. since

题型：模拟题难度：| 查看答案

The hero said he didn"t think twice ______ diving into the freezing river to rescue that child.

[ ]

A. before
B. after
C. until
D. when

题型：模拟题难度：| 查看答案

We need some more facts and figures _____ we make the final decision.

[ ]

A. since
B. before
C. after
D. until

题型：模拟题难度：| 查看答案

_____ registered, goods are not allowed to be sold in supermarkets.

[ ]

A. If
B. When
C. While
D. Unless

题型：模拟题难度：| 查看答案