They didn’t attend the discussion, although they _________.
A．should B．would have toC．should have toD．should have
D
本題考查情態(tài)動(dòng)詞。句中should have done本應(yīng)當(dāng)做，句意：他們沒有參加討論，盡管他們應(yīng)當(dāng)本應(yīng)當(dāng)參加。
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