单项选择题

It is known that （） Galileo invented （） telescope.

A. the ... the
B. / ... the
C. a ... /
D. the ... a

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单项选择题
The letters PTA （） parent-teacher association.

A. stand for
B. call for
C. reach for
D. care for
单项选择题
She sent her application to the university last week, but （） any response up to now.

A. didn’t receive
B. weren’t receiving
C. hadn’t received
D. hasn’t received
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