填空题

The new machine ought to (test) ______ before it is put to use.

【参考答案】

be tested

<上一题目录下一题>

热门试题

单项选择题

A．A working schedule.
B．A business plan.
C．A computer problem.
D．A computer class.

填空题

Yesterday they received a written (invite) ______ to a dinner from Mr. Black.