单项选择题

We must be aware that reading is a ______ tool of learning in higher education.

A．basic
B．basis
C．base
D．basics
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单项选择题
We were surprised because it was the first time they us ______ to lunch.
A．invite
B．invited
C．have invited
D．had invited
单项选择题
______ the island, I noticed row upon row of newly built houses.
A．Approach
B．Approached
C．Approaching
D．Having approached
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