(Even though) Sedat (has been studying) English for three years before he came (

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问题 (Even though) Sedat (has been studying) English for three years before he came (to the United States), It is still difficult for him (to express himself).

选项 A、Even though
B、has been studying
C、to the United States
D、to express himself

答案 B

解析把has been studying改成had been studying(过去完成时)，因为 study English这个动作发生在he came to the United States之前，came to是过去时，所以study English是“过去的过去”，应该用过去完成时，而不是现在完成时。

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(Even though) Sedat (has been studying) English for three years before he came (

ThenewEnglishdictionaryIboughtyesterday______mealmosttwentyyuan.A、spe

Twodayspastbeforeherealizedthatthetaskwasbeyondhiscapacity.A、pastB、

(Unlike)Americanswhoseem(toprefer)coffee,theEnglish(drinks)(agreatde

Theballwasprobablyinventedbecause______.[br]TheEgyptiansthoughtthatba

Hehaslivedhereforyears,______nobodyknowswhatheis.A、andbutB、thoughC

______I’mmistaken,I’veseenthatmanbefore.A、UnlessB、IfC、BecauseD、Provide

Beforejoiningthearmy,hespentalotoftimeinthevillage______hebelonge

Don’tforget______thewindowbeforeleavingtheroom.A、tohaveclosedB、toclos

Thecompanyofficial______Ithoughtwouldbefiredreceivedaraise.A、whomB、w

(Eventhough)shelooksvery(young),sheis(twiceolderthan)my(twenty-year-

Aseriesofborderincidentswould______leadthetwocountriestowar.A、inevitab

TheEisteddfodisa(n)______festivalofpoetry,musicandotherarts.A、EnglishB

Animationmeansmakingthingswhicharelifelesscomeliveandmove.Sincee

梁的弯矩图如图所示，最大值在B截面，在梁的A、B、C、D四个截面中，剪力为零的截

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我国21世纪初可持续发展涉及经济主要体现为(　)。A:合理使用、节约和保护资源