We are sorry for the short delivery by 20 tons. This ( ) you some trouble in meeting orders of your clients.<br />A.must cause<br>B.must have caused<br>C.has caused<br>D. will be caused

We are sorry for the short delivery by 20 tons. This ( ) you some trouble in meeting orders of your clients.
A.must cause
B.must have caused
C.has caused
D. will be caused

出自：国家开放大学英语语法

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