The reason why he failed is ___________ he was too careless.
A. because
B. that
C. for
D. because of
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What I want to know is ____________he likes the gift given by us.
A. that
B. if
C. whether
D. which
The reason is __________ I missed the bus.
A. that
B. when
C. why
D. what
By the 1960s and 1970s fast foods became mone of American's strongest exports _________________________________(随着麦当劳、汉堡王扩展到欧洲和世界其他地区).
_____________________________________________(快餐业的重要开拓者之一)was a man named Carl Karcher.