It is strange that the small boy _________ work out such a difficult exercise, which is even hard to settle for adults.
A．shouldB．mightC．couldD．would
D
情態(tài)動詞辨析。A. 應(yīng)該  B.可能 C.能夠；can的過去時態(tài)  D.將要。句意：很奇怪，這個小男孩想要算出如此難的一道，甚至成年人都很難解決的練習(xí)。選D。
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