从A、B、C、D四个选项中，选出可以填入空白处的最佳选项.
1.At first sight, bag seems to be made of real leather, while actually it is just imitation.
A.the;an B.the;the C.a;the D.a;an
2.2009marks the 115th anniversary of the birth of Mei Lanfang, as one of the greatest Peking Opera artists in modern history.
A.considering B.considered C.who considers D.consider
3.It was in August of 2009 the typhoon Morakot severely struck Taiwan, causing hundreds of peo-ple dead, missing and injured.
A.which B.when C.that D.what
4.Susan’s score is the highest in her department. She have studied very hard.
A.may B.should C.must D.oug
