Since we ________ our homework now. Let’s have a rest.
A．doB．a(chǎn)re doing C．will do D．have done
D
since 為陳述原因，而根據(jù)后文的內(nèi)容Let’s have a rest.可知事情已經(jīng)做了，故用現(xiàn)在完成時(shí)，故選D
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