单项选择题

The extremely dry conditions through Iowa over the past five years ______ a great deal of damage to the state.

(A) causes
(B) causing
(C) to cause
(D) have caused
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Not until you promise not to be tardy again ______ consider transferring you to the newly established branch office.
(A) I will
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Had he set out by taxi rather than by bus, John ______ reached the bank in time for the money transfer.
(A) can have
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