单项选择题

The Mercandiser widget is (so) named because it (is believed) (to be discovered) by Albert Mercandiser, a Dutchman (by) birth.

A．so
B．is believed
C．to be discovered
D．by
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单项选择题
As Christmas approached, with people (crowded) department stores, restaurants, theaters and movie houses, the downtown area (was), (as always), the (busiest).
A．crowded
B．was
C．as always
D．busiest
单项选择题
The car ran out of gas! That ______ the cause. I filled the tank this morning.
A．mustn't be
B．must have been
C．can be
D．can't have been
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