单项选择题

An old friend from abroad, ______ I was expecting to stay with me, telephoned from the airport.

A．that
B．which
C．whom
D．who
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单项选择题
Mrs. Douglas unknowingly left a package ______ on the shop counter.
A．laying
B．to lie
C．laid
D．lying
单项选择题
It is vital that food and shelter are made ______ for people in the flood-stricken area.
A．free
B．useful
C．available
D．usable
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