单项选择题

If there’s a leak，the first thing to do is to （）the gas supply.

A.break off
B.shut off
C.turn down
D.get down

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单项选择题
He began to write two hours ago.He （）have finished the article now.

A.ought
B.must
C.would
D.had to
单项选择题
Most students find it hard to get a good score on the exam as it is more difficult and （）than they expected.

A.skillful
B.experienced
C.cultural
D.complicated
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