问题

been living in the United Statesfor twenty years, but seldom_______ so lonely as now

A:how
B:where
C:when
D:why

正确答案是：

同类题型

BothLoulan and Pompeii are believed _______ their civilizations about 2,000 years ago.

Thanks __ helping me, Jim.

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Is your brother at home—No. He ________ the library. He hasn’t come back yet.