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12．一 Has Robert got home？
一 Not yet．He ______ be home by now．（　　）

A．

can

B．

need

C．

must

D．

should

分析 -羅伯特已經(jīng)到家了嗎？
-還沒有．他現(xiàn)在本應(yīng)該在家的．

解答答案：D
句意表達(dá)的是與現(xiàn)在事實(shí)相反的假設(shè)；can可能，need需要，must一定，should本應(yīng)該．故選D．

點(diǎn)評 虛擬語氣是表示與事實(shí)相反的假設(shè)，構(gòu)成方式有：對現(xiàn)在或?qū)恚瑮l件句中用一般過去時態(tài)，主語用情態(tài)動詞加動詞原形；對過去，條件句中用過去完成時態(tài)，主語用情態(tài)動詞加完成時態(tài)．學(xué)習(xí)時，要牢記構(gòu)成方式．

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