题目内容

Don’t make a noise! They _______on a physics problem now.
A．will workB．are workingC．workedD．have worked
B
此题考查现在进行时的基本用法。表示正在进行的动作。句意：不好出生。他们现在正在解决一道物理问题。结合语境及时间状语，可知下文描述的是现在正在进行的动作，故用现在进行时态。选B。
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