单项选择题

You should have put the milk in the icebox; I expect it ______ undrinkable by now.

A．became
B．had become
C．has become
D．becomes
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单项选择题
Ms. Green has been living in town for only one year, yet she seems to be ______ with everyone who comes to the store.
A．accepted
B．admitted
C．admired
D．acquainted
单项选择题
Researchers discovered that plants infected with a virus give off a gas that ______ disease resistance in neighboring plants.
A．contracts
B．activates
C．maintains
D．prescribes
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