<p>_______ anything like this style of architecture before, we thought we were looking at giant sculptures, not buildings.</p>
<p>A. Never had we seen
B. Never having seen
C. Never seeing</p>
<p>Please also tell me why is B right but A and C wrong.</p>
<p>This action happens in the past, so C is wrong (to me). A is a run-on sentence.</p>
<p>Because it is Past Perfect Tense. [Even] happened [before] another [event].</p>
<p>^I get it’s past perfect tense, but why can we use “having” in this case?</p>
<p>Another question:</p>
<p>It is not part perfect continuous, I guess</p>