单项选择题

()you call me to say you're not coming, I'll see you at the theatre.

A．Though
B．Whether
C．Until
D．Unless

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单项选择题
() of the students in my class are girls.

A．Two thirds
B．Two third
C．Second thirds
D．Second fifth
单项选择题
I () the Summer Palace before, but I decided to visit it a second time.

A．have visited
B．visited
C．hadn't visited
D．had visited
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