单项选择题

We regret __ you that the computers you ordered are out of stock.

A．informing
B．to inform
C．having informed
D． m have informed
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单项选择题
Not until the game had begun __ at the sports ground.
A．had he arrived
B．he have arrived
C．he should arrive
D．did he arrived
单项选择题
The modem __ long pencil can draw a line 35 miles in length.
A． 7-inched
B．7-inch
C．7-inchs
D．7-inches
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