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[*][*]
[*] why DoEs thE spEAkEr sAy this:
A．BECAusE only A FEw sEvEntEEnth-CEntury housEs hAvE BEEn stuDiED
B、BECAusE thE EArliEst housE plAn ContinuEs to BE Built toDAy
C．BECAusE DoCumEnts ABout ColoniAl housEs ArE DiFFiCult to rEAD
D．BECAusE plAn typE mAy not rEvEAl ExACtly whEn A housE wAs Built