单项选择题

Since their method doesn't work, we can （） other measures.

A. fall on
B. fall down on
C. fall back on
D. fall in upon

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单项选择题
The son has been （） his parents （）about his examination results.（）

A.keeping…in the dark
B.making…in the dark
C.bringing…in the dark
D.holding…in the dark
单项选择题
He must have overslept, or he （） then.

A.would have been here
B.had to be here
C.should be here
D.would be here
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