单选题
It was last summer ______ we were invited to his birthday party.
A、
that
B、
when
C、
than
D、
who
【正确答案】
A
【答案解析】
这是一个强调句型，强调状语last night；强调结构强调状语时可用that从句即“It is... that...”。答案为A。
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