单项选择题

Earnings from exports have fallen sharply ______ fluctuations on the international currency markets.

A. since
B. due to
C. consequently
D. because
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The crates were ______ by freight train.
A. transport
B. transports
C. transported
D. be transported
单项选择题
If we are unable to supply any item that you have ordered, you ______ by email.
A. will be notified
B. will notify
C. are notifying
D. notify
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