问题

Father ____ for London on business upon my arrival, so I didn’t see him
A:has left
B:left
C:was leaving
D:had left
B:left
C:was leaving
D:had left
正确答案是:
同类题型
_______ I go on a trip to Shanghai— Yes, you may.
Which is more important, English or math —I think English is as _______ as math.
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The players expected there ____ more free time before coming back to the country from abroad.