单项选择题

Of the three common salicylates,_______.

A．the preference of aspirin for most therapeutic uses.
B．for most therapeutic uses aspirin preferred
C．preferring aspirin for most therapeutic used
D．aspirin is preferred for most therapeutic uses

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单项选择题

I went home _________ I had finished work.

A．quickly
B．straightly
C．presently
D．directly

单项选择题

The last half of the nineteenth century _________ the steady improvement in the means of travel.

A．has witnessed
B．witnessed
C．is witnessed
D．has been witnessed