问题

ike to invite you to a partytomorrow evening.– Thank you, but ______ I’ll be free I’muncertain.

A:while
B:if
C:when
D:whether

正确答案是：

同类题型

My mother ___ here last Saturday. She ____in Nanjing. She ____back now.

I won’tpass the exam ______I work hard..

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The West Lake is famous for its beautiful scenery.