一、单项选择（共15小题；每小题1分，满分15分）
从a、b、c、d四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
1.the loss has not yet been ________accurately(精确地)，but it is believed to be well beyond a hundred million dollars.
a. calculated b. solved c. explored d. operated
2. ---- did your boss phone you again the next day?
----- no, it was a week ________ he gave me a second call.
a since b. when c. before d .after
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